Characterization and Genetic Analysis of a Novel Mutant mst of Rice Defective in Flower Development

A spontaneous mutant with multiple stigmas (mst) was found in an indica rice line 466. The mst mutant exhibits normal at the vegetative development stage and produces normal inflorescence structures. The difference between the mutant and the wild type was observed when the stamen primordium began to develop. In the mst florets, palea and lemma opened, lodicules were homeotically transformed into palea/lemma-like structures, and stamens were homeotically transformed into carpel-like structures. It looked like multiple stigmas being full of the whole floret. The phenotypic changes of mst were very similar to that of B-like mutant spw1. Compared with other mutants with pistillate morphologies, the severe mst florets showed that the inner three floral organs were completely changed into palea/lemma-like structures. Moreover, the mutant was female sterile. Occasionally, with the changing environment, one or two stamens were fertile. Genetic analysis indicated that the mutant traits were controlled by a single recessive gene.

作 者： LI Yun XU Pei-zhou ZHANG Hong-yu FU Shao-hong YANG Jin ZHANG Ru-quan WU Xian-jun   作者單位： LI Yun(Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130, China;Crops Research Institute, Chengdu Academy of Agricultural and Forestry Sciences, Wenjiang 611130, China)

XU Pei-zhou,ZHANG Hong-yu,WU Xian-jun(Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130, China;Key Laboratory of Southwest Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Ya'an 625014, China)

FU Shao-hong,YANG Jin,ZHANG Ru-quan(Crops Research Institute, Chengdu Academy of Agricultural and Forestry Sciences, Wenjiang 611130, China) 

刊 名： 水稻科學（英文版）  英文刊名： RICE SCIENCE  年，卷(期)： 2009 16(1)  分類號： S5  關鍵詞： rice   flower development   multiple stigmas mutant   floral organ identity