Expression quantitative trait loci analysis of two genes encoding rubisco activase in soybean.

Plant Physiology
Zhitong YinDeyue Yu


Rubisco activase (RCA) catalyzes the activation of Rubisco in vivo and plays a crucial role in photosynthesis. However, until now, little was known about the molecular genetics of RCA in soybean (Glycine max), one of the most important legume crops. Here, we cloned and characterized two genes encoding the longer alpha -isoform and the shorter beta -isoform of soybean RCA (GmRCA alpha and GmRCA beta, respectively). The two corresponding cDNAs are divergent in both the translated and 3 ' untranslated regions. Analysis of genomic DNA sequences suggested that the corresponding mRNAs are transcripts of two different genes and not the products of a single alternatively splicing pre-mRNA. Two additional possible alpha -form RCA-encoding genes, GmRCA03 and GmRCA14, and one additional beta -form RCA-encoding gene, GmRCA11, were also isolated. To examine the function and modulation of RCA genes in soybean, we determined the expression levels of GmRCA alpha and GmRCA beta, Rubisco initial activity, photosynthetic rate, and seed yield in 184 soybean recombinant inbred lines. Correlation of gene expression levels with three other traits indicates that RCA genes could play an important role in regulating soybean photosynthetic capacity and s...Continue Reading


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