Genotypic variation in transpiration efficiency due to differences in photosynthetic capacity among sugarcane-related clones

文献类型： 外文期刊

第一作者： Li, Chunjia

作者： Li, Chunjia;Lu, Xin;Xu, Chaohua;Fan, Yuanhong;Jackson, Phillip;Cai, Qing;Basnayake, Jayapathi;Lakshmanan, Prakash;Ghannoum, Oula

作者机构：

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 ）

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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.

分类号： Q94

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