Introgressions from Oryza rufipogon Increase Photosynthetic Efficiency of KMR3 Rice Lines

作     者：G.HARITHA T.VISHNUKIRAN P.YUGANDHAR N.SARLA D.SUBRAHMANYAM 

作者机构：Indian Institute of Rice Research(ICAR)RajendranagarHyderabad 500030India 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2017年第24卷第2期

页      面：85-96页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 09[农学] 0901[农学-作物学] 0836[工学-生物工程] 0902[农学-园艺学] 

基　　金：supported by a grant from the Department of Biotechnology Government of India DBT(No.BT/AB/FG-2(PHII)IA/2009) 

主　　题：photosynthesis wild species rice yield biomass introgression line 

摘      要：To understand the wild Oryza genome effect on photosynthesis and its relation to total dry matter accumulation in an elite rice variety, a set of 40 stable introgression lines(ILs) BC_3F_8 derived from a cross of Oryza sativa(KMR3) × Oryza rufipogon(WR120) were grown under well watered conditions. Leaf gas exchange measurements and leaf chlorophyll estimates were conducted at the flowering stage. The results revealed significant variations in net photosynthetic rate(Pn), transpiration rate(E), transpiration efficiency(Pn/E) and carboxylation efficiency(Pn/C_i). Pn showed significant positive correlation with E, stomatal conductance(g_s), Pn/C_i and total canopy dry matter. Specific leaf area and leaf thickness were not significantly correlated with Pn. Thirty-seven out of 40 ILs showed higher Pn than KMR3 [11.28 μmol/(m^2·s)], and 20 ILs showed higher Pn than WR120 [15.08 μmol/(m^2·s)]. The line IL194 showed the highest Pn [21.62 μmol/(m^2·s)] with increased total canopy dry matter followed by lines IL381, IL106, IL363-12, IL198, IL86-18 and IL50, which exhibited Pn above 18.0 μmol/(m^2·s). The ILs with enhanced Pn are a potential source for developing rice varieties and hybrids with higher biomass and yield.