Chain correlation between variables of gas exchange and yield potential in different winter wheat cultivars
Chain correlation between variables of gas exchange and yield potential in different winter wheat cultivars
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DOI：
10.1023/a:1007222016017
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发表时间：
2000-01-01
期刊：
影响因子：
2.7
通讯作者：
Kuang, TY
中科院分区：
文献类型：
--
作者：
Jiang, GM;Hao, NB;Kuang, TY
五个有代表性的冬小麦旗叶气体交换和籽粒产量潜力的变量在相同的管理和灌溉条件下，不同发育阶段的品种差异较大。高产品种的净光合速率(P-N)、光量子通量密度(PPFD)、饱和光合速率(P-sat)、气孔导度(g(S))和CO2固定的最大表观量子效率(Phi(m，APP))显著高于低产品种，但暗呼吸速率(Rd)和补偿光照(I-c)显著低于低产品种。与低产品种向高产品种整体增产71%相比，Pn、PSAT、Phi(m，APP)和g(S)分别高出13、19、57和32%，而R-D和I-c分别降低19%和76%。这种差异在开花期明显较大(如净光合速率增加33%)，这表明这一时期可能是辅助进一步选择更好的品种的最佳时期。而蒸腾速率(E)和水分利用效率(WUE)差异不大。在不同发育阶段，特别是开花期，P-N和P-sat与phi(m，app)、g(S)和产量潜力呈正相关，与R-D和I-c呈负相关。因此，高产小麦品种在光合作用及其相关参数上比低产品种具有更好的特性。
Variables of gas exchange of flag leaves and grain yield potentials of five representative winter wheat (Triticum aestivum L.) cultivars varied greatly across different development stages under the same management and irrigation. The cultivars with high yield potential had higher net photosynthetic rate (P-N), PPFD (photosynthetic photon flux density) saturated photosynthetic rate (P-sat), stomatal conductance (g(s)), and maximum apparent quantum yield of CO2 fixation (Phi (m,app)) than those with low grain yield, but their dark respiration rate (RD) and compensation irradiance (I-c) were remarkably lower. Compared with overall increase of yield potential of 71% from low yield cultivars to high yield ones, PN, Psat, Phi (m,app), and g(s) were 13, 19, 57, and 32 % higher, respectively; but R-D and I-c decreased by 19 and 76 %, respectively. Such difference was evidently large during anthesis stage (e.g., PN by 33 %), which indicated that this period could be the best for assisting further selection for better cultivars. However, transpiration rate (E) and water use efficiency (WUE) differed only little. At different development stages, especially at anthesis, P-N and P-sat were positively correlated with Phi (m,app), g(s) and yield potential, and negatively correlated with R-D and I-c. Thus the high-yield-potential winter wheat cultivars possess many better characters in photosynthesis and associated parameters than the low-yield cultivars.