Genotypic variation in transpiration efficiency due to differences in photosynthetic capacity among sugarcane-related clones
文献类型: 外文期刊
作者: Li, Chunjia 1 ; Jackson, Phillip 2 ; Lu, Xin 1 ; Xu, Chaohua 1 ; Cai, Qing 3 ; Basnayake, Jayapathi 4 ; Lakshmanan, Pr 1 ;
作者机构: 1.Yunnan Acad Agr Sci, Yunnan Sugarcane Res Inst, 363 Eastern Linquan Rd, Kaiyuan 661600, Yunnan, Peoples R China
2.CSIRO, Australian Trop Sci Innovat Precinct, Private Mail Bag PO, Aitkenvale, Qld 4814, Australia
3.Yunnan Acad Agr Sci, Biotechnol & Germplasm Resources Inst, 9 Xueyun Rd, Kunming 650221, Yunnan, Peoples R China
4.Sugar Res Australia Ltd, POB 117, Ayr, Qld 48072, Australia
5.Sugar Res Australia Ltd, 50 Meiers Rd, Indooroopilly, Qld 4068, Australia
6.Western Sydney Univ, Hawkesbury Inst Environm, ARC Ctr Excellence Translat Photosynth, Locked Bag 1797, Penrith, NSW 1797, Australia
关键词: Breeding;genotypic variation;photosynthesis;sugarcane;transpiration efficiency
期刊名称:JOURNAL OF EXPERIMENTAL BOTANY ( 影响因子:6.992; 五年影响因子:7.86 )
ISSN:
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收录情况: SCI
摘要: Sugarcane, derived from the hybridization of Saccharum officinarumxSaccharum spontaneum, is a vegetative crop in which the final yield is highly driven by culm biomass production. Cane yield under irrigated or rain-fed conditions could be improved by developing genotypes with leaves that have high intrinsic transpiration efficiency, TEi (CO2 assimilation/stomatal conductance), provided this is not offset by negative impacts from reduced conductance and growth rates. This study was conducted to partition genotypic variation in TEi among a sample of diverse clones from the Chinese collection of sugarcane-related germplasm into that due to variation in stomatal conductance versus that due to variation in photosynthetic capacity. A secondary goal was to define protocols for optimized larger-scale screening of germplasm collections. Genotypic variation in TEi was attributed to significant variation in both stomatal and photosynthetic components. A number of genotypes were found to possess high TEi as a result of high photosynthetic capacity. This trait combination is expected to be of significant breeding value. It was determined that a small number of observations ( 16) is sufficient for efficiently screening TEi in larger populations of sugarcane genotypes The research methodology and results reported are encouraging in supporting a larger-scale screening and introgression of high transpiration efficiency in sugarcane breeding. However, further research is required to quantify narrow sense heritability as well as the leaf-to-field translational potential of genotypic variation in transpiration efficiency-related traits observed in this study.
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