Abstract
Effect of salinity (1.5, 3.0, 4.5, or 6.0 dS·m -1 ) on growth and physiology of 1-year-old `Hass' avocado ( Persea americana Mill.) trees on one of three rootstocks, `Thomas', `Toro Canyon', or `Duke 7', was investigated to determine the relative salinity tolerance of these rootstocks and to determine possible reasons for any observed differences in tolerance. Leaves of trees on `Thomas' rootstock had the highest leaf Na + , Cl - , and necrosis compared to trees on the other two rootstocks. Exposure to salinity resulted in decreased growth of shoots on all rootstocks, but was greatest on `Thomas' and least on `Duke 7'. The oldest leaves on all rootstocks had the highest proportion of leaf necrosis, whereas younger leaves exhibited almost no necrosis. Salinity reduced net CO 2 assimilation (A) and chlorophyll concentrations of scion leaves on all rootstocks, but more in older leaves than in younger leaves. Although the effects of salinity on A were greater for trees on `Thomas' on one measurement date, overall, rootstock differences in A were not significant for any leaf age. Differences in response to salinity among rootstocks were noted primarily in morphological traits such as growth and leaf necrosis, rather than physiological traits such as gas-exchange and water relations. Based on overall growth and physiological response to salinity, trees on `Thomas' performed poorest, whereas trees on `Duke 7' exhibited the greatest salt tolerance. The relative tolerance of the various rootstocks appeared to be due primarily to their ability to exclude Na + and Cl - from the scion.
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Claims 10
Claim · model-written summary
Thomas rootstock had the highest leaf sodium and chloride levels.
Verbatim
e0“Leaves of trees on `Thomas' rootstock had the highest leaf Na + , Cl - , and necrosis compared to trees on the other two rootstocks”
Claim · model-written summary
Thomas rootstock had the most leaf necrosis.
Verbatim
e0“Leaves of trees on `Thomas' rootstock had the highest leaf Na + , Cl - , and necrosis compared to trees on the other two rootstocks”
Claim · model-written summary
Salinity decreased shoot growth on all rootstocks, most on Thomas and least on Duke 7.
- Taxon
- Avocado
Persea americanat0 - Organ / stage
- shootse0
- Treatment
- salinitye0
- Outcome
- growth of shootse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to salinity resulted in decreased growth of shoots on all rootstocks, but was greatest on `Thomas' and least on `Duke 7'”
t0“Avocado Trees”
Claim · model-written summary
Oldest leaves had greatest necrosis; younger leaves had almost none.
- Taxon
- AvocadoPersea americanat0
- Organ / stage
- oldest leavese0
- Outcome
- proportion of leaf necrosise0
- Direction
- higheste0
- Comparator
- younger leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The oldest leaves on all rootstocks had the highest proportion of leaf necrosis, whereas younger leaves exhibited almost no necrosis”
t0“Avocado Trees”
Claim · model-written summary
Salinity reduced net CO2 assimilation, more in older leaves.
- Taxon
- AvocadoPersea americanat0
- Organ / stage
- scion leavese0
- Treatment
- Salinitye0
- Outcome
- net CO 2 assimilatione0
- Direction
- reducede0
- Comparator
- younger leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity reduced net CO 2 assimilation (A) and chlorophyll concentrations of scion leaves on all rootstocks, but more in older leaves than in younger leaves”
t0“Avocado Trees”
Claim · model-written summary
Salinity reduced chlorophyll concentrations, more in older leaves.
- Taxon
- AvocadoPersea americanat0
- Organ / stage
- scion leavese0
- Treatment
- Salinitye0
- Outcome
- chlorophyll concentrationse0
- Direction
- reducede0
- Comparator
- younger leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity reduced net CO 2 assimilation (A) and chlorophyll concentrations of scion leaves on all rootstocks, but more in older leaves than in younger leaves”
t0“Avocado Trees”
Claim · model-written summary
Overall rootstock differences in net assimilation were not significant.
- Taxon
- AvocadoPersea americanat0
- Outcome
- rootstock differences in Ae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overall, rootstock differences in A were not significant for any leaf age”
t0“Avocado Trees”
Claim · model-written summary
Thomas performed poorest under salinity.
Verbatim
e0“trees on `Thomas' performed poorest, whereas trees on `Duke 7' exhibited the greatest salt tolerance”
Claim · model-written summary
Duke 7 had the greatest salt tolerance.
Verbatim
e0“trees on `Thomas' performed poorest, whereas trees on `Duke 7' exhibited the greatest salt tolerance”
Claim · model-written summary
Rootstock salt tolerance appeared primarily related to excluding sodium and chloride from the scion.
- Taxon
- AvocadoPersea americanat0
- Outcome
- relative tolerancee0
- Qualifier
- ability to exclude Na + and Cl - from the scione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative tolerance of the various rootstocks appeared to be due primarily to their ability to exclude Na + and Cl - from the scion”
t0“Avocado Trees”
The same questions in other papers
salinity · physiology: pigments · Persea americana (avocado)Positive and negative results
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salinity · physiology: photosynthesis · Persea americana (avocado)Results agree
1 paper in the same direction as this paper
- negative
salinity · growth · Persea americana (avocado)Results agree
3 papers in the same direction as this paper
- no effect
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.