Paper Details


Positive regulation of phytochrome A on shade avoidance in maize

Hao Qiang Yu, Fu Ai Sun, Feng Zhong Lu, Wen Qi Feng, Yuan Yuan Zhang, Bing Liang Liu, Lin Yang, Feng Ling Fu and Wan Chen Li

Shade avoidance is elongation, apical dominance and some other responses of plants adapting to deficiency light intensity. The spindling plants are susceptible to lodging, resulting in productivity and quality decline. Many studies have indicated the effect of phytochrome B as the predominant photoreceptor for negative regulation of shade avoidance. The role of phytochrome A on shade avoidance has not yet been clarified in detail. In this study, we overexpressed ZmPhyA1 gene in maize inbred line 18-599. The T-DNA integration site was found out between the 284557834th and the 284557835th bp of chromosome 1 by genome walking amplification. The plant height, ear height, and leaf length under ear of the transgenic line was significantly higher or longer than the receptor line. Leaf angle under ear was significantly less. These phenotypes were concluded as the positive regulation of the ZmPhyA1 gene to shade avoidance of the receptor line, because no sequence similar to any functional genes, repeated sequences or transposons were found from the flanking sequences from 46 kb upstream to 314 kb downstream of the T-DNA integration site. Therefore, expression suppression of the ZmPhyA1 gene could be employed for photo-biotechnological improvement for dense planting variety.

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