Abstract
【Objective】The main purpose of this paper was to screen leaf traits related to drought resistance, explore the methods of traits index evaluation, and to reveal drought resistance mechanisms of different peanut cultivars. 【Method】 The drought resistance was studied in twelve peanut cultivars under drought stress and normal irrigation in a pot experiment at seedling stage and a pool culture experiment at pod setting stage. Keeping the water treatments by using weighing at seedling stage and supplemental irrigation based on testing soil moisture at pod setting stage with rain-shedding during drought stress. Leaf morphological and physiological traits including organization structure, thickness, specific leaf weight(SLW), leaf area per plant(PLA), photosynthetic rate(Pn), chlorophyll content under the conditions of normal water supply and drought stress at seedling stage were tested, and the relationship between those traits and drought resistance was studied. Drought resistances of cultivars were scored with drought coefficient of biomass at seedling stage and yield at pod setting stage. Drought resistance mechanisms of leaf were evaluated by traits index. 【Result】 The results by two years experiments showed that, under drought stress, the drought resistance coefficients of different peanut cultivars were significantly different. Drought resistance at seedling and pod-setting stages was basically identical. According to yield-drought resistance coefficient, twelve peanut cultivars could be divided into 3 grads: high-resistance, including A596, Shanhua 11 and Rugaoxiyangsheng; mid-resistance, including Huayu 20, Nongda 818, Haihua 1, Shanhua 9 and 79266; weak-resistance, including ICG6848, Baisha1016, Hua17 and Penglaiyiwohou. Water stress changed organization structure in leaves, functional leaf area, PLA, Gs, Pn and Tr were reduced, but SLW of peanuts was increased under soil drought stress. A significant difference in leaf traits among peanut cultivars with different drought resistances was observed. Leaf thickness, ratio of palisade tissue to spongy tissue(PTT/STT), SLW, PLA and Pn were higher under both drought stress and normal irrigation in cultivars with high drought resistance. The drought resistance mechanism of twelve peanut cultivars was different, under drought stress, Rugaoxiyangsheng and Shanhua 11 presented as higher PTT/STT, SLW and Pn, Shanhua 9 and Huayu 20 had larger PLA, A596 was mainly higher in Pn. Correlation analysis between drought resistance coefficient and leaf PTT/STT, SLW, PLA and Pn under drought stress condition was significant. 【Conclusion】 Shanhua11 could be used as a standard variety for high drought resistance identification, and 79266 could be used as a standard variety for weak resistance identification. Treatment of 40% RWC drought stress at 10 d after germination, the leaf PTT/STT, SLW, PLA and Pn could be used to identify the drought resistance of peanuts leaf. PTT/STT, SLW and PLA also could be used to identify the drought resistance of peanuts leaf under normal water condition at anthesis stage. Shanhua 11 could be used as a suitable standard cultivar for leaf drought resistance traits identification in peanut.
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Claims 20
Claim · model-written summary
Drought resistance coefficients of peanut cultivars differed significantly under drought stress.
- Taxon
- peanut
Arachis hypogaeae1 - Material
- different peanut cultivarse1
- Treatment
- drought stresse1
- Outcome
- drought resistance coefficientse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results by two years experiments showed that, under drought stress, the drought resistance coefficients of different peanut cultivars were significantly different”
Claim · model-written summary
Drought resistance at seedling and pod-setting stages was basically identical.
- Taxon
- peanutArachis hypogaeat1
- Organ / stage
- seedling and pod-setting stagese1
- Outcome
- Drought resistancee1
- Direction
- basically identicale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought resistance at seedling and pod-setting stages was basically identical”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
A596, Shanhua 11 and Rugaoxiyangsheng were graded as high drought resistance by yield-drought resistance coefficient.
- Taxon
- peanutArachis hypogaeae1
- Material
- A596, Shanhua 11 and Rugaoxiyangshenge1
- Outcome
- high-resistancee1
- Qualifier
- yield-drought resistance coefficiente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“According to yield-drought resistance coefficient, twelve peanut cultivars could be divided into 3 grads: high-resistance, including A596, Shanhua 11 and Rugaoxiyangsheng”
Claim · model-written summary
Huayu 20, Nongda 818, Haihua 1, Shanhua 9 and 79266 were graded as mid drought resistance by yield-drought resistance coefficient.
- Taxon
- peanutArachis hypogaeat1
- Material
- Huayu 20, Nongda 818, Haihua 1, Shanhua 9 and 79266e1
- Outcome
- mid-resistancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“mid-resistance, including Huayu 20, Nongda 818, Haihua 1, Shanhua 9 and 79266”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
ICG6848, Baisha1016, Hua17 and Penglaiyiwohou were graded as weak drought resistance by yield-drought resistance coefficient.
- Taxon
- peanutArachis hypogaeat1
- Material
- ICG6848, Baisha1016, Hua17 and Penglaiyiwohoue1
- Outcome
- weak-resistancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“weak-resistance, including ICG6848, Baisha1016, Hua17 and Penglaiyiwohou”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
Water stress changed the organization structure of peanut leaves relative to normal irrigation.
- Taxon
- peanutsArachis hypogaeae1
- Treatment
- Water stresse1
- Outcome
- organization structure in leavese1
- Direction
- changede1
- Comparator
- normal irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Water stress changed organization structure in leaves, functional leaf area, PLA, Gs, Pn and Tr were reduced, but SLW of peanuts was increased under soil drought stress”
e2“under drought stress and normal irrigation”
Claim · model-written summary
Functional leaf area, PLA and Gs of peanuts were reduced by water stress relative to normal irrigation.
- Taxon
- peanutsArachis hypogaeae1
- Treatment
- Water stresse1
- Outcome
- functional leaf area, PLA, Gse1
- Direction
- reducede1
- Comparator
- normal irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Water stress changed organization structure in leaves, functional leaf area, PLA, Gs, Pn and Tr were reduced, but SLW of peanuts was increased under soil drought stress”
e2“under drought stress and normal irrigation”
Claim · model-written summary
Pn and Tr of peanuts were reduced by water stress relative to normal irrigation.
- Taxon
- peanutsArachis hypogaeae1
- Treatment
- Water stresse1
- Outcome
- Pn and Tre1
- Direction
- reducede1
- Comparator
- normal irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Water stress changed organization structure in leaves, functional leaf area, PLA, Gs, Pn and Tr were reduced, but SLW of peanuts was increased under soil drought stress”
e2“under drought stress and normal irrigation”
Claim · model-written summary
SLW of peanuts increased under soil drought stress relative to normal irrigation.
- Taxon
- peanutsArachis hypogaeae1
- Treatment
- soil drought stresse1
- Outcome
- SLWe1
- Direction
- increasede1
- Comparator
- normal irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Water stress changed organization structure in leaves, functional leaf area, PLA, Gs, Pn and Tr were reduced, but SLW of peanuts was increased under soil drought stress”
e2“under drought stress and normal irrigation”
Claim · model-written summary
A significant difference in leaf traits was found among peanut cultivars with different drought resistances.
- Taxon
- peanutArachis hypogaeae1
- Material
- peanut cultivars with different drought resistancese1
- Outcome
- leaf traitse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A significant difference in leaf traits among peanut cultivars with different drought resistances was observed”
Claim · model-written summary
Leaf thickness, PTT/STT and SLW were higher under drought stress and normal irrigation in cultivars with high drought resistance.
- Taxon
- peanutArachis hypogaeat1
- Material
- cultivars with high drought resistancee1
- Treatment
- both drought stress and normal irrigatione1
- Outcome
- Leaf thickness, ratio of palisade tissue to spongy tissue(PTT/STT), SLWe1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Leaf thickness, ratio of palisade tissue to spongy tissue(PTT/STT), SLW, PLA and Pn were higher under both drought stress and normal irrigation in cultivars with high drought resistance”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
PLA and Pn were higher under drought stress and normal irrigation in cultivars with high drought resistance.
- Taxon
- peanutArachis hypogaeat1
- Material
- cultivars with high drought resistancee1
- Treatment
- both drought stress and normal irrigatione1
- Outcome
- PLA and Pne1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Leaf thickness, ratio of palisade tissue to spongy tissue(PTT/STT), SLW, PLA and Pn were higher under both drought stress and normal irrigation in cultivars with high drought resistance”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
Rugaoxiyangsheng and Shanhua 11 had higher PTT/STT, SLW and Pn under drought stress.
- Taxon
- peanutArachis hypogaeat1
- Material
- Rugaoxiyangsheng and Shanhua 11e1
- Treatment
- drought stresse1
- Outcome
- PTT/STT, SLW and Pne1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“under drought stress, Rugaoxiyangsheng and Shanhua 11 presented as higher PTT/STT, SLW and Pn, Shanhua 9 and Huayu 20 had larger PLA, A596 was mainly higher in Pn”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
Shanhua 9 and Huayu 20 had larger PLA under drought stress.
- Taxon
- peanutArachis hypogaeat1
- Material
- Shanhua 9 and Huayu 20e1
- Treatment
- drought stresse1
- Outcome
- PLAe1
- Direction
- largere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“under drought stress, Rugaoxiyangsheng and Shanhua 11 presented as higher PTT/STT, SLW and Pn, Shanhua 9 and Huayu 20 had larger PLA, A596 was mainly higher in Pn”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
A596 had mainly higher Pn under drought stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“under drought stress, Rugaoxiyangsheng and Shanhua 11 presented as higher PTT/STT, SLW and Pn, Shanhua 9 and Huayu 20 had larger PLA, A596 was mainly higher in Pn”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
Drought resistance coefficient correlated significantly with leaf PTT/STT, SLW, PLA and Pn under drought stress.
- Taxon
- peanutArachis hypogaeat1
- Treatment
- drought stress conditione1
- Outcome
- drought resistance coefficiente1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Correlation analysis between drought resistance coefficient and leaf PTT/STT, SLW, PLA and Pn under drought stress condition was significant”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
Shanhua11 could be used as a standard variety for identifying high drought resistance in peanut.
- Taxon
- peanutArachis hypogaeat1
- Material
- Shanhua11e1
- Outcome
- high drought resistance identificatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Shanhua11 could be used as a standard variety for high drought resistance identification”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
79266 could be used as a standard variety for identifying weak resistance in peanut.
- Taxon
- peanutArachis hypogaeat1
- Material
- 79266e1
- Outcome
- weak resistance identificatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“79266 could be used as a standard variety for weak resistance identification”
t1“Drought Resistant Peanut Cultivars”
Claim · model-written summary
Leaf PTT/STT, SLW, PLA and Pn after 40% RWC drought stress at 10 d after germination could identify drought resistance of peanut leaves.
- Taxon
- peanutsArachis hypogaeae1
- Treatment
- 40% RWC drought stress at 10 d after germinatione1
- Outcome
- identify the drought resistance of peanuts leafe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Treatment of 40% RWC drought stress at 10 d after germination, the leaf PTT/STT, SLW, PLA and Pn could be used to identify the drought resistance of peanuts leaf”
Claim · model-written summary
PTT/STT, SLW and PLA could identify drought resistance of peanut leaves under normal water condition at anthesis stage.
- Taxon
- peanutsArachis hypogaeae1
- Organ / stage
- anthesis stagee1
- Treatment
- normal water conditione1
- Outcome
- identify the drought resistance of peanuts leafe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“PTT/STT, SLW and PLA also could be used to identify the drought resistance of peanuts leaf under normal water condition at anthesis stage”
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