Abstract
Drought is one of the major limitations to plant productivity worldwide. Identifying suitable screening tools and quantifiable traits would facilitate the crop improvement process for drought tolerance. In the present study, we evaluated the ability of four relatively physiological parameters (variable-to-maximum chlorophyll a fluorescence ratio, F v/F m; estimated leaf chlorophyll content via SPAD index; leaf temperature, LT; and, leaf relative water content, RWC) to distinguish between drought tolerant and susceptible sugarcane genotypes subjected to a 90-d drought cycle. Eight field-grown genotypes were studied. By 45 d after the onset of treatments, the F v/F m, SPAD index and RWC of drought-stressed plants had declined significantly in all genotypes compared to values at the onset of well-watered treatments. However, the reductions were more severe in leaves of susceptible genotypes. Under drought stress, the tolerant genotypes as a group, maintained higher F v/F m (8%), SPAD index (15%), and RWC (16%) than susceptible genotypes. In general, LT of drought-stressed plants was higher (~4ºC) than that of well-watered plants but the relative increase was greater among drought susceptible genotypes. Under drought stress, LT of tolerant genotypes was on average 2.2ºC lower than that of susceptible genotypes. The results are consistent with the tolerant-susceptible classification of these genotypes and indicate that these tools can be reliable in screening for drought tolerance, with F v/F m, SPAD index and LT having the added advantage of being nondestructive and easily and quickly assessed.
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Claims 9
Claim · model-written summary
Drought significantly reduced F v/F m, SPAD index and RWC across sugarcane genotypes by day 45.
Verbatim
e0“By 45 d after the onset of treatments, the F v/F m, SPAD index and RWC of drought-stressed plants had declined significantly in all genotypes compared to values at the onset of well-watered treatments.”
t0“sugarcane”
Claim · model-written summary
Drought-associated reductions in these traits were more severe in susceptible sugarcane genotypes.
Verbatim
e0“the reductions were more severe in leaves of susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
Tolerant sugarcane genotypes maintained 8% higher F v/F m under drought.
Verbatim
e0“Under drought stress, the tolerant genotypes as a group, maintained higher F v/F m (8%), SPAD index (15%), and RWC (16%) than susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
Tolerant sugarcane genotypes maintained 15% higher SPAD index under drought.
Verbatim
e0“Under drought stress, the tolerant genotypes as a group, maintained higher F v/F m (8%), SPAD index (15%), and RWC (16%) than susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
Tolerant sugarcane genotypes maintained 16% higher RWC under drought.
Verbatim
e0“Under drought stress, the tolerant genotypes as a group, maintained higher F v/F m (8%), SPAD index (15%), and RWC (16%) than susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
Drought-stressed sugarcane had approximately 4ºC higher leaf temperature than well-watered plants.
Verbatim
e0“LT of drought-stressed plants was higher (~4ºC) than that of well-watered plants but the relative increase was greater among drought susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
The drought-associated leaf temperature increase was greater in susceptible sugarcane genotypes.
Verbatim
e0“the relative increase was greater among drought susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
Under drought, tolerant sugarcane genotypes had 2.2ºC lower leaf temperature than susceptible genotypes.
Verbatim
e0“Under drought stress, LT of tolerant genotypes was on average 2.2ºC lower than that of susceptible genotypes.”
t0“sugarcane”
Claim · model-written summary
The physiological parameters were reliable tools for screening sugarcane drought tolerance.
- Taxon
- sugarcanet0
- Outcome
- screening for drought tolerancee0
- Qualifier
- nondestructive and easily and quickly assessede0
Not reportedComparatorValue
Verbatim
e0“these tools can be reliable in screening for drought tolerance, with F v/F m, SPAD index and LT having the added advantage of being nondestructive and easily and quickly assessed.”
t0“sugarcane”
The same questions in other papers
drought · physiology: water · Saccharum officinarum (sugarcane)Positive and negative results
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- no effect
- negative
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