Abstract
Nowadays, water deficit is one of the major environmental stress issues affecting sugarcane crops around the world. It has been causing significant production decrease due to the increased mortality rates generated by water stress in sugarcane plantations. The aim of the current study is to assess sugarcane morphological and yield responses during different phenophases of sugarcane varieties when plants are subjected to drought stress in the fields of a tropical region. Six sugarcane varieties, namely: SP79-1011, RB855113, RB92579, RB867515, RB72454, and RB855536, were subjected to water stress. The herein adopted water regimes were (i) irrigated crop and (ii) crop subjected to natural drought in the field. Plants were cultivated under water stress imposition throughout three phenological stages (i) tillering, three months after planting; (ii) intense growth, seven months after planting; and (iii) ripening, eleven months after planting. The irrigation treatment consisted of supplementing the crop with 50 mm of water per month during the dry season, whereas non-irrigated plants were naturally grown under water stress conditions throughout the experiment. Water stress mostly affected the sugarcane crop during the intense growth phase. Varieties RB72454 and RB855536 presented smaller green-leaf number, as well as narrower leaf width and smaller leaf area under water stress; besides, they showed low productive potential and high stress susceptibility index (SSI). Stalk height maintenance and the larger number of tillers in RB92579 plants subjected to water stress helped balancing yield rates. This variety also showed the best drought tolerance (DTI) and yield/tolerance indices (YTI); moreover, the principal component analysis evidenced that leaf area, plant height and yield were important factors to distinguish the most tolerant varieties. Such results show that RB92579 is more drought tolerant and has better physiological acclimation potential than the other five varieties; therefore, it can be recommended for crops subjected to drought periods.
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Claims 8
Claim · model-written summary
Water stress affected sugarcane most during intense growth.
Verbatim
e0“Water stress mostly affected the sugarcane crop during the intense growth phase”
Claim · model-written summary
RB72454 and RB855536 had fewer green leaves, narrower leaves, and smaller leaf area under water stress.
- Taxon
- sugarcane plantst0
- Material
- RB72454 and RB855536e0
- Treatment
- water stresse0
- Outcome
- green-leaf number, as well as narrower leaf width and smaller leaf areae0
- Direction
- smallere0
Not reportedComparator
Verbatim
e0“Varieties RB72454 and RB855536 presented smaller green-leaf number, as well as narrower leaf width and smaller leaf area under water stress”
t0“sugarcane plants”
Claim · model-written summary
RB72454 and RB855536 showed low productive potential and high stress susceptibility.
Verbatim
e0“they showed low productive potential and high stress susceptibility index (SSI)”
e1“Varieties RB72454 and RB855536”
t0“sugarcane plants”
Claim · model-written summary
RB92579 maintained stalk height and more tillers under water stress, helping balance yield.
Verbatim
e0“Stalk height maintenance and the larger number of tillers in RB92579 plants subjected to water stress helped balancing yield rates”
t0“sugarcane plants”
Claim · model-written summary
RB92579 had the best drought tolerance and yield tolerance indices.
Verbatim
e0“This variety also showed the best drought tolerance (DTI) and yield/tolerance indices (YTI)”
e1“RB92579 plants”
t0“sugarcane plants”
Claim · model-written summary
PCA identified leaf area, plant height, and yield as discriminators of tolerant varieties.
Verbatim
e0“principal component analysis evidenced that leaf area, plant height and yield were important factors to distinguish the most tolerant varieties”
t0“sugarcane plants”
Claim · model-written summary
RB92579 was more drought tolerant and had better physiological acclimation than the other varieties.
Verbatim
e0“RB92579 is more drought tolerant and has better physiological acclimation potential than the other five varieties”
t0“sugarcane plants”
Claim · model-written summary
The authors recommend RB92579 for cultivation during drought periods.
Verbatim
e0“RB92579 is more drought tolerant and has better physiological acclimation potential than the other five varieties; therefore, it can be recommended for crops subjected to drought periods”
t0“sugarcane plants”
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