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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (12): 2258-2266.doi: 10.3724/SP.J.1006.2012.02258


Photosynthetic Characteristics and Its Significance of Topmost Three Leaves at Fruiting Stage in Wheat with Presenile Flag Leaf

ZHANG Song-Wu,WANG Chang-Fa,MIAO Fang,ZHOU Chun-Ju,YAU You-Hua,LI Gui-Xian   

  1. Laboratory of Low-Temperature Plants, College of Science, Northwest A&F University, Yanling 712100, China
  • Received:2012-02-13 Revised:2012-07-05 Online:2012-12-12 Published:2012-10-08


A type of wheat has been discovered by the long time observation that the flag leaf senesces earlier than second and third leaves from top, differing from the conventional understanding for leaf senescing sequence in the majority of wheats. To reveal the biological characteristics of the type of wheat and its possible utilization in theoretical study and practice, we carried out an experiment of the type of wheat with presenile flay leaf, using normal wheat as the control in 2005–2011. The results showed that : in the type of wheat with presenile flag leaf , the leaf chlorophyll content , transpiration rate and net photosynthetic rate were higher in the penultimate leaves, the roots, stems, and leaves were more developed, its grain filling rate was faster, and some important agronomy traits caused by above-mentioned factors were excellent, as compared with normal wheat. The grain volume, 1000-grain weight and weight of grain per spike of this type of wheat were 9.64%, 10.35%, and 8.43% higher than those of the normal wheat, respectively, and this may be closely related to the special grain filling mechanism differing from that of the normal wheat whose flag leaves work as the main nutrient sources for grain filling in the whole fruiting process. This study provided an new approach to research wheat growth, fruiting and senescence theory, further increasing whew yield.

Key words: Leaf senescing, Abnormal stem, Normal stem, Photosynthetic and fruiting characteristics

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