Study on Photosynthetic Characteristics of a Rice CMS Line Renong 1A with Yellow-green Revertible Leaves

[Objective] Understanding the photosynthetic characteristics of the rice CMS line Renong 1A with leaf color markers can promote its utilization in breeding. [Method] The wild type （WT） of rice spontaneous mutant with virescent-yellow leaves that was the male parent of Renong 1A was selected as the control, and the contents of photosynthetic pigments, photosynthetic parameters, light-response curve and chlorophyll fluorescence kinetic parameters of Renong 1A were measured at the tillering stage. [Result] New leaves of Renong 1A yellowed obviously in the early period. Chlorophyll content, photosynthetic rate and values of parameters Pdt, F/Fm Fv＇/Fm＇,φPSII, and ETR of Renong 1A were all significantly lower than those of the control. However, there was no difference between Renong 1A and the control in terms of photosynthetic rate of leaves turning green. [Conclusion] The photosynthetic capacity of new leaves of Renong 1A decreased at the early stage due to the reduction of chlorophyll content, and then it became normal at the later stage with the increase of chlorophyll content.

Breeding of Indica Rice CMS Line Renong 1A with Virescent-yellow Leaf

Renong 1Ais a new indica CMS line with leaf color marker, developed by testcrossing and continuous backcrossing, using a spontaneous mutant with vires-cent-yel ow leaf isolated from the progenies of T98B /Jin 23B ×Yixiang 1B as the male parent, and Fengyuan A as the female parent. Al the chlorotic leaves of Renong 1A turn green in later developmental stages from leaf tip to base. This is the reason why Renong 1A is a new ideal leaf color marker material in indica rice. It shows apparent and stable leaf marker trait, good agronomic traits, high outcross-ing rate, complete pol en sterility, fine grain quality and high combining ability. Renong 1A has already been technical y identified and certified by Hainan Provincial Crop Variety Appraisal Committee in 2013.