PHOTOSYNTHESIS CROP GROWTH AND RESPIRATION OF A TALL AND SHORT RICE VARIETIES
PHOTOSYNTHESIS CROP GROWTH AND RESPIRATION OF A TALL AND SHORT RICE VARIETIES
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DOI：
10.1080/00380768.1973.10432519
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发表时间：
1973-01-01
影响因子：
2
通讯作者：
YOSHIDA S
中科院分区：
文献类型：
--
作者：
COCK J H;YOSHIDA S
IRS和Peta的作物生长速率（CGR）随叶面积指数（LAI）的增加而增加，达到一定值后，作物生长速率（CGR）随叶面积指数（LAI）的增加而增加。超过这些值，CGR几乎是恒定的。CGR的平台值IRS大于Peta。两个品种作物的呼吸作用均不随叶面积指数的增加而线性增加，而是随叶面积指数的增加而渐近增加，总光合作用由（CGRx0.9）+呼吸作用估算。两个品种的总光合作用随着叶面积指数的增加而增加，最高可达6左右，然后再增加不多。IRS的最大总光合作用大于Peta，在很宽的叶面积指数和叶面积比范围内，两个品种的呼吸作用均占总光合作用的40%左右。6个不同株型品种也存在类似的关系，这些数据表明，所有供试品种在较宽的光合速率范围内，光合作用与呼吸作用之间的平衡相对稳定。因此，最佳叶面积指数不太可能由于光合作用和呼吸作用之间的不平衡而出现。当高LAI值下大量施氮显著增加叶片下垂，从而降低总光合作用时，可能出现最佳LAI值。
The crop growth rate (CGR) of IRS and Peta increased as leaf area index (LAI) increased up to certain values. Beyond these values, the CGR was almost constant.The plateau value of CGR was greater for IRS than for Peta. The respiration of the crop for both varieties did not increase linearly but asymptotically with increase in LAI.The gross photosynthesis was estimated from (CGRx0.9)+respiration. The gross photosynthesis of both varieties increased with increasing LAI up to about 6, then showed little further increase. The maximum gross photosynthesis of IRS was greater than that of Peta.The respiration of both varieties was approximately 40 percent of gross photosynthesis over a wide range of values for LAI and leaf area ratio. The similar relationship was also found for 6 varieties of different plant type.These data suggest that the balance between photosynthesis and respiration is relatively stable over a broad range of photosynthetic rates for all varieties tested. Thus, it is unlikely that optimum LAI occurs due to an imbalance between photosynthesis and respiration. An optimum LAI value may occur when heavy application of nitrogen markedly increases the droopiness of leaves at high LAI values, thereby decreasing gross photosynthesis.