Abstract
Problem statement: Approximately 20% of sugarcane (Saccharum spp.) is grown on sand soils in south Florida, USA. Sugarcane yields in the region linearly increased in last 33 years on organic (muck) soils, but not on sand soils. Water deficit during the formative growth phase on sand soils probably limits sugarcane yields. Approach: A greenhouse study was conducted in 2009 and 2010 to evaluate the physiological and growth responses of sugarcane to water-deficit stress during formative growth. Treatments included organic (muck) and sand soils and two water regimes Well Watered (WW) and Water-Deficit Stress (WS). Sugarcane cultivar CP 80-1743 was planted in pots and fertilized with N, P and K based on soil analyses. All pots were well watered until 58 days after planting, when water was withheld from the WS pots. During the WS treatment, plant growth rate, leaf Relative Water Content (RWC), proline content and photosynthesis components were measured. Final tillers, Green Leaf Area (GLA) and shoot biomass were determined 27 (in 2009) or 22 (in 2010) days after initiating the WS treatment. Results: Stress symptoms of sugarcane plants appeared 7-10 days earlier on sand soil than on muck soil. Water stress reduced stomatal conductance (gs), Photosystem II Photochemical Efficiency (PSII), leaf Photosynthesis rate (Pn), the number of tillers and GLA, resulting in reduced shoot biomass, especially on sand soil. Neither leaf RWC nor proline content was a sensitive WS indicator. Conclusion: Nondestructive measurements of physiological traits of gs, PSII and Pn during the formative stage may be useful for early detection of water stress in sugarcane.
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Claims 7
Claim · model-written summary
Stress symptoms appeared 7-10 days earlier on sand than muck soil.
Verbatim
e0“Stress symptoms of sugarcane plants appeared 7-10 days earlier on sand soil than on muck soil.”
Claim · model-written summary
Water stress reduced stomatal conductance, PSII efficiency, and photosynthesis.
- Taxon
- sugarcanet0
- Treatment
- Water stresse0
- Outcome
- stomatal conductance (gs), Photosystem II Photochemical Efficiency (PSII), leaf Photosynthesis rate (Pn)e0
- Direction
- reducede0
- Qualifier
- especially on sand soile0
Not reportedComparator
Verbatim
e0“Water stress reduced stomatal conductance (gs), Photosystem II Photochemical Efficiency (PSII), leaf Photosynthesis rate (Pn), the number of tillers and GLA, resulting in reduced shoot biomass, especially on sand soil.”
t0“Sugarcane”
Claim · model-written summary
Water stress reduced tiller number and green leaf area.
Not reportedComparator
Verbatim
e0“Water stress reduced stomatal conductance (gs), Photosystem II Photochemical Efficiency (PSII), leaf Photosynthesis rate (Pn), the number of tillers and GLA, resulting in reduced shoot biomass, especially on sand soil.”
t0“Sugarcane”
Claim · model-written summary
Water stress reduced shoot biomass, especially on sand soil.
- Taxon
- Sugarcanet0
- Treatment
- Water stresse0
- Outcome
- shoot biomasse0
- Direction
- reducede0
- Qualifier
- especially on sand soile0
Not reportedComparator
Verbatim
e0“Water stress reduced stomatal conductance (gs), Photosystem II Photochemical Efficiency (PSII), leaf Photosynthesis rate (Pn), the number of tillers and GLA, resulting in reduced shoot biomass, especially on sand soil.”
t0“Sugarcane”
Claim · model-written summary
Leaf relative water content was not a sensitive indicator of water stress.
Verbatim
e0“Neither leaf RWC nor proline content was a sensitive WS indicator.”
t0“Sugarcane”
Claim · model-written summary
Proline content was not a sensitive indicator of water stress.
Verbatim
e0“Neither leaf RWC nor proline content was a sensitive WS indicator.”
t0“Sugarcane”
Claim · model-written summary
The authors suggest gs, PSII, and Pn measurements for early water-stress detection.
Verbatim
e0“Nondestructive measurements of physiological traits of gs, PSII and Pn during the formative stage may be useful for early detection of water stress in sugarcane.”
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