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Acta Agron Sin ›› 2017, Vol. 43 ›› Issue (12): 1856-1863.doi: 10.3724/SP.J.1006.2017.01856

• RESEARCH NOTES • Previous Articles     Next Articles

Anatomical Structure and Photosynthetic Characteristics of a Yellow Leaf Mutant YL1 in Sesame (Sesamum indicum L.)

LIU Hong-Yan, ZHOU Fang, LI Jun, YANG Min-Min, ZHOU Ting, HAO Guo-Cun,ZHAO Ying-Zhong   

  1. Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Biology and Genetic Improvement of Oil Crops,Ministry of Agriculture,Wuhan 430062,China
  • Received:2017-03-24 Revised:2017-09-10 Online:2017-12-12 Published:2017-09-28
  • Contact: 赵应忠,E-mail:zhaoyz63@163.com
  • Supported by:

    This study was supported by fund from the National Science Foundation of China (31771877), China Agriculture Research System (CARS-14), and Agricultural Science and Technology Innovation Program, CAAS (CAAS-ASTIP-2013-OCRI)


Phenotypic markers play an important role in crop breeding and genetic studies. A yellow leaf 1 (YL1) mutant has been found from sesame landrace‘Miaoqian Zhima’, which can be inherited stably. In this study, we compared YL1 mutant and its wild type (WT) in leaf anatomical structure, photosynthetic characteristics and biological traits. The structures of chloroplast in both top leaf and expanded leaves of YL1 were greatly different from those of WT at various development stages. The stomatal guard cell number in abaxial epidermis in YL1 was twice that in WT. In addition, the contents of chlorophyll a, total chlorophyll and carotenoid in YL1 were 30-40% of that in WT, and the chlorophyll b content in YL1 even as low as 20% of that in WT. At early flowering stage, YL1 showed significantly lower photosynthetic rate than WT, but the difference was not significant at end flowering stage. Compared with WT type, YL1 had significantly longer growth duration, delayed initial flowering time and shorter plant height, but capsules per plant and thousand-seed weight was slightly reduced. The microscopic observation revealed that YL1 is the chlorophyll deficiency mutant due to chloroplast defect, which was characterized with irregular chloroplast structure and reduced grana and granum lamella.

Key words: Sesame, Yellow leaf mutant, Chloroplast microstructure and ultrastructure, Photosynthetic characteristics, Physiological and biochemical characteristics

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