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《Acta Agronomica Sinica》 2004-05
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Photosynthetic Characteristics in Non-leaf Organs of Winter Wheat Cultivars Differing in Grain-leaf Ratio

LI Zhao-Xia~1,ZHAO Shi-Jie~(1,*),MENG Qing-Wei~1,ZOU Qi~1,TIAN Ji-Chun~2 (()~1College of Life Sciences;()~2Department of Agronomy Shandong Agricultural University, Tai'an 271018, Shandong, China)  
Chlorophyll contents, net photosynthetic rates and chlorophyll fluorescence parameters of two winter wheat(Triticum aestivum L.)cultivars, Lu 22 and Lu 14, were measured to study the differences in photosynthetic characteristics among different photosynthetic organs of two wheat cultivars with different grain-leaf area ratio. The results showed that chlorophyll contents in different organs of Lu 22 with high grain-leaf area ratio was higher than that of Lu 14 with low grain-leaf area ratio. Especially at the late stage of senescence, Lu 22 was able to maintain higher chlorophyll content in non-leaf organs when chlorophyll content and photosynthetic capability of leaf declined significantly, which was important to grain filling. At the early stage of senescence, the difference of F_v/F_m among different organs of two wheat cultivars was not obvious. But at the late stage of senescence,F_v/F_m of Lu 14 with low grain-leaf area ratio was decreased more rapidly than that of Lu 22 with high grain-leaf area ratio, which indicated that Lu 22 was able to maintain higher absorption and transfer efficiency of light energy. Φ_(PSⅡ) of leaves and ears in Lu 22 was higher than that in Lu 14, which meant more energy absorbed by leaves and ears transferred to photochemical reaction in former. With the process of senescence, excess energy increased. The ability of dissipating excess energy increased in non-leaf organs, especially in the ear. Lu 22 with higher grain-leaf area ratio was able to maintain larger sink capacity by smaller leaf area because of its longer photosynthetic duration of non-leaf organs. Thus the photosynthetic characteristics of non-leaf organs played important role for increasing grain weight.
【Fund】: 国家重点基础研究发展规划项目 (G19980 10 10 0 );; 山东省科技厅重点项目 (鲁科农字 [2 0 0 1] 5 0 0号 )“超级小麦育种技术研究”的资助
【CateGory Index】: S512.1
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