The Expression of TaRca2-α Gene Associated with Net Photosynthesis Rate, Biomass and Grain Yield in Bread Wheat Triticum aestivum L. under Field ConditionsReport as inadecuate




The Expression of TaRca2-α Gene Associated with Net Photosynthesis Rate, Biomass and Grain Yield in Bread Wheat Triticum aestivum L. under Field Conditions - Download this document for free, or read online. Document in PDF available to download.

Improvement in activation of Rubisco by Rubisco activase can potentially enhance CO2 assimilation and photosynthetic efficiency in plants. The three homoeologous copies of TaRca2-α were identified on chromosomes 4AL, 4BS and 4DS TaRca2-α-4AL, TaRca2-α-4BS, and TaRca2-α-4DS in bread wheat. Expression patterns of the three copies at heading Z55, anthesis Z67 and grain-filling Z73 stages were investigated through qRT-PCR analyses in a panel of 59 bread wheat genotypes and their effects on net photosynthesis rate Pn, biomass plant-1 BMPP and grain yield plant-1 GYPP were further explored. Different but similar expression patterns were observed for the three copies of TaRca2-α at the three growth stages with highest expression at grain-filling stage. TaRca2-α-4BS expressed higher at the three stages than TaRca2-α-4AL and TaRca2-α-4DS. The 59 genotypes could be clustered into three groups as high 7 genotypes, intermediate 41 genotypes and low 11 genotypes expression based on the expression of the three copies of TaRca2-α at three growth stages. Significant variations P<0.01 were observed among the three groups of bread wheat genotypes for Pn, BMPP and GYPP. Generally, the genotypes with higher TaRca2-α expression also showed higher values for Pn, BMPP and GYPP. The expressions of the three copies of TaRca2-α at heading, anthesis and grain-filling stages were positively correlated with Pn, BMPP and GYPP P<0.01 with stronger association for TaRca2-α-4BS at grain-filling stage. These results revealed that the expression of TaRca2-α contribute substantially to Pn, BMPP and GYPP, and suggested that manipulating TaRca-α expression may efficiently improve Pn, BMPP and GYPP in bread wheat and detecting TaRca-α expression levels with emphasis on TaRca2-α-4BS may be a positive strategy for selection in improving photosynthetic efficiency and grain yield of bread wheat.



Author: Iqbal Saeed, Daoura Goudia Bachir, Liang Chen, Yin-Gang Hu

Source: http://plos.srce.hr/



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