Abstract
Water limitation is a major production constraint for sugarcane worldwide. However, to date, there has been little investigation of patterns of genetic variation in the response to water stress in sugarcane. Field experiments were conducted over 3 years under fully irrigated and managed water stress conditions at two locations in Northern Queensland in Australia. Eighty-nine genetically diverse clones were evaluated for their yield performance and sugar attributes. Water stress treatments reduced cane yield [tonnes of cane per hectare (TCH)] and total dry matter (TDM) by 17-52% and 20-56%, respectively, compared with irrigated treatments in the same experiments. Nevertheless, there was little genotype×environment interaction variation for TCH, TDM, or commercial cane sugar (CCS), and hence high genetic correlations between the irrigated and water stress treatments across environments. Both commercial and unselected clones performed poorly under severe stress environments, while the commercial clones outperformed the unselected clones under mild and moderate stress conditions. The results presented here highlight the contribution of intrinsic potential yields (yield under well-irrigated conditions) of some selected and unselected clones to maintain relatively high productivity in a range of moderate stress conditions imposed. The physiological basis for the high genetic correlations is at present unclear, but some explanations are hypothesized. The choice of stress levels in selection trials would not appear to be a critical issue for sugarcane breeding programmes, at least for the early phases of selection, where similar ranking clones across a range of moderate water stresses may be expected.
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Claims 8
Claim · model-written summary
Water stress reduced cane yield by 17-52% compared with irrigated treatments.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e1“Water stress treatments reduced cane yield [tonnes of cane per hectare (TCH)] and total dry matter (TDM) by 17-52% and 20-56%, respectively, compared with irrigated treatments in the same experiments”
e2“Field experiments were conducted over 3 years under fully irrigated and managed water stress conditions at two locations in Northern Queensland in Australia”
Claim · model-written summary
Water stress reduced total dry matter by 20-56% compared with irrigated treatments.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e1“Water stress treatments reduced cane yield [tonnes of cane per hectare (TCH)] and total dry matter (TDM) by 17-52% and 20-56%, respectively, compared with irrigated treatments in the same experiments”
Claim · model-written summary
Genetic correlations between irrigated and water stress treatments across environments were high.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e3“there was little genotype×environment interaction variation for TCH, TDM, or commercial cane sugar (CCS), and hence high genetic correlations between the irrigated and water stress treatments across environments”
Claim · model-written summary
Genotype×environment interaction variation for TCH, TDM and CCS was little.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e3“there was little genotype×environment interaction variation for TCH, TDM, or commercial cane sugar (CCS), and hence high genetic correlations between the irrigated and water stress treatments across environments”
Claim · model-written summary
Both commercial and unselected clones performed poorly under severe stress.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e4“Both commercial and unselected clones performed poorly under severe stress environments”
e6“Eighty-nine genetically diverse clones were evaluated for their yield performance and sugar attributes”
Claim · model-written summary
Commercial clones outperformed unselected clones under mild and moderate stress.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e5“the commercial clones outperformed the unselected clones under mild and moderate stress conditions”
e6“Eighty-nine genetically diverse clones were evaluated for their yield performance and sugar attributes”
Claim · model-written summary
Intrinsic potential yields of some selected and unselected clones maintain relatively high productivity under moderate stress.
Verbatim
e0“Water limitation is a major production constraint for sugarcane worldwide”
e7“some selected and unselected clones to maintain relatively high productivity in a range of moderate stress conditions imposed”
Claim · model-written summary
The choice of stress levels in selection trials is not a critical issue for sugarcane breeding programmes.
Verbatim
e1“The choice of stress levels in selection trials would not appear to be a critical issue for sugarcane breeding programmes”
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