Photosynthetica 1997, 33(2):199-204 | DOI: 10.1023/A:1022156112243

Planting density effects on assimilation and partitioning of photosynthates during grain filling in the late-sown wheat

Zhenlin Wang1, Jinmin Fu1, Mingrong He1, Yanping Yin1, Hongming Cao1
1 Department of Agronomy, Shandong Agricultural University, Taian, Shandong Province, P.R. China

Leaf blades of the late-sown winter wheat produced the major portion, i.e., more than 60 %, of the total 14C-photosynthates at grain filling, but ear (rachis and glumes) only about 15 %, sheaths about 11 %, and stem internodes about 11 %. The change of plant density in this experiment had little influence on the 14CO2-photoassimilation of the ear (rachis and glumes), flag leaf lamina, sheaths and stem internodes, but markedly affected photosynthesis of the second, the third and lower leaves. The photosynthetic rate [expressed as specific radioactivity, s-1 kg-1(d.m.)] and the amount of 14CO2 photosynthates decreased significantly in the second, the third and other lower leaves at a high plant density. Upon grain-filling of the late-sown wheat, the grain was the major importer of photosynthates. Yet partitioning to the stem internodes depended on the plant density. Stem was the importer of photosynthates at a low plant density, but the exporter at a high plant density. In plants at a low plant density a fairly large proportion of photosynthates was distributed into the roots. The middle and lower above-ground parts of the late-sown wheat at a high plant density decreased or lost their function early. As a result, the plant senesced earlier. However, the grain setting, filling and yielding were restricted. An appropriately low plant density was suitable for prolonging the function of the middle and lower organs, delaying the senescence of plant, increasing the source supply for grain filling, and improving the grain yield.

Additional key words: photosynthates; 14CO2; ear; leaf insertion; photosynthesis; Triticum aestivum L.

Published: March 1, 1997  Show citation

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Wang, Z., Fu, J., He, M., Yin, Y., & Cao, H. (1997). Planting density effects on assimilation and partitioning of photosynthates during grain filling in the late-sown wheat. Photosynthetica, 33(2), 199-204. doi: 10.1023/A:1022156112243
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