Abstract
Drought severely limits sugarcane productivity in many regions of the world. This study characterized physiological responses to different drought durations in a diverse set of sugarcane genotypes in two crop cycles (plant and ratoon cane). A split-plot design was used where three drought treatments, namely, no drought (SD0), short-term drought (SD1), and long-term drought (SD2), were assigned to main plots and six diverse sugarcane genotypes to subplots. Drought reduced photosynthesis, leaf area index, and biomass yield. However, the study found significant differences in physiological responses to drought among genotypes in both crops. F03-362 (F1), KK09-0358 (BC1), and KK3 (cultivar) demonstrated greater tolerance to drought by maintaining comparatively higher photosynthetic activity, while KK09-0939 (BC2) and TPJ04-768 (BC1) were more sensitive. KK3 and UT12 (cultivar) consistently maintained comparatively higher levels of photosynthesis under drought in the ratoon crop, although stomatal conductance values were comparable to those of other genotypes. Drought significantly reduced dry matter in all genotypes, but more so in the two cultivars. The study demonstrated variable levels of sensitivity to drought among diverse genotypes with different physiological responses being induced by different drought treatments. This information is useful for sugarcane production management and breeding programs.
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Claims 14
Claim · model-written summary
Drought reduced photosynthesis.
Not reportedComparator
Verbatim
t0“Sugarcane”
e0“Drought reduced photosynthesis, leaf area index, and biomass yield”
Claim · model-written summary
Drought reduced leaf area index and biomass yield.
Not reportedComparator
Verbatim
t0“Sugarcane”
e0“Drought reduced photosynthesis, leaf area index, and biomass yield”
Claim · model-written summary
Genotypes differed significantly in drought physiology in both crops.
Verbatim
t0“Sugarcane”
e0“significant differences in physiological responses to drought among genotypes in both crops”
Claim · model-written summary
F03-362 maintained comparatively higher photosynthetic activity under drought.
Verbatim
t0“Sugarcane”
e0“F03-362 (F1), KK09-0358 (BC1), and KK3 (cultivar) demonstrated greater tolerance to drought by maintaining comparatively higher photosynthetic activity”
Claim · model-written summary
KK09-0358 maintained comparatively higher photosynthetic activity under drought.
Verbatim
t0“Sugarcane”
e0“F03-362 (F1), KK09-0358 (BC1), and KK3 (cultivar) demonstrated greater tolerance to drought by maintaining comparatively higher photosynthetic activity”
Claim · model-written summary
KK3 maintained comparatively higher photosynthetic activity under drought.
Verbatim
t0“Sugarcane”
e0“F03-362 (F1), KK09-0358 (BC1), and KK3 (cultivar) demonstrated greater tolerance to drought by maintaining comparatively higher photosynthetic activity”
Claim · model-written summary
KK09-0939 was more drought sensitive.
Verbatim
t0“Sugarcane”
e0“KK09-0939 (BC2) and TPJ04-768 (BC1) were more sensitive”
Claim · model-written summary
TPJ04-768 was more drought sensitive.
Verbatim
t0“Sugarcane”
e0“KK09-0939 (BC2) and TPJ04-768 (BC1) were more sensitive”
Claim · model-written summary
KK3 maintained comparatively higher photosynthesis under drought in ratoon cane.
Verbatim
t0“Sugarcane”
e0“KK3 and UT12 (cultivar) consistently maintained comparatively higher levels of photosynthesis under drought in the ratoon crop”
Claim · model-written summary
UT12 maintained comparatively higher photosynthesis under drought in ratoon cane.
Verbatim
t0“Sugarcane”
e0“KK3 and UT12 (cultivar) consistently maintained comparatively higher levels of photosynthesis under drought in the ratoon crop”
Claim · model-written summary
Stomatal conductance was comparable to other genotypes for KK3 under ratoon drought.
Verbatim
t0“Sugarcane”
e0“KK3 and UT12 (cultivar) consistently maintained comparatively higher levels of photosynthesis under drought in the ratoon crop, although stomatal conductance values were comparable to those of other genotypes”
Claim · model-written summary
Stomatal conductance was comparable to other genotypes for UT12 under ratoon drought.
Verbatim
t0“Sugarcane”
e0“KK3 and UT12 (cultivar) consistently maintained comparatively higher levels of photosynthesis under drought in the ratoon crop, although stomatal conductance values were comparable to those of other genotypes”
Claim · model-written summary
Drought significantly reduced dry matter in all genotypes.
Not reportedComparator
Verbatim
t0“Sugarcane”
e0“Drought significantly reduced dry matter in all genotypes”
Claim · model-written summary
Dry matter reduction was greater in the two cultivars.
Verbatim
t0“Sugarcane”
e0“Drought significantly reduced dry matter in all genotypes, but more so in the two cultivars”
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