SHADING EFFECTS ON THE YIELD OF AN ARGENTINEAN WHEAT CULTIVAR
SHADING EFFECTS ON THE YIELD OF AN ARGENTINEAN WHEAT CULTIVAR
复制标题
DOI：
10.1017/s0021859600076085
复制
发表时间：
1991-02-01
影响因子：
2
通讯作者：
SLAFER, GA
中科院分区：
文献类型：
--
作者：
SAVIN, R;SLAFER, GA
1987年和1988年在阿根廷进行的两个田间试验中，半矮秆小麦品种利奥内斯INTA在开花前后进行了50%入射辐射的遮光处理。 处理降低了生物（地上干物质）产量，籽粒产量和每平方米的籽粒数。 穗粒数/m ~ 2与开花期穗干重和花前20天至花后10天的光温商呈极显著的线性相关。 籽粒产量受库限制，遮光处理降低了库强度。 花前同化物对籽粒产量的贡献在遮荫作物中比在未遮荫对照中小;在未遮荫作物中，近40%的籽粒产量由花前同化物贡献，而在花前遮荫作物中，这种贡献可以忽略不计。 花前同化物对籽粒的贡献比例与灌浆期茎干重的下降密切相关。 遮荫对主茎和分蘖的影响是一致的。
Shading treatments of 50% of the incident radiation were applied to the semidwarf wheat cultivar Leones INTA before and after anthesis in two field experiments in Argentina in 1987 and 1988. The treatments reduced biological (above-ground dry matter) yield, grain yield and number of grains/m2. Number of grains/m2 was closely and linearly correlated with ear dry weight at anthesis and with the photothermal quotient, calculated from 20 days before to 10 days after anthesis. Grain yield was sink limited, and the shading treatments reduced sink strength. The contribution of preanthesis assimilates to grain yield was smaller in the shaded crops than in the unshaded controls; in unshaded crops, almost 40% of grain yield was contributed by preanthesis assimilates whilst in preanthesis shaded crops this contribution was negligible. The proportion of preanthesis assimilates contributed to the grain was closely related to the decrease in stem dry weight during grain filling. The effects of shading on main stems and tillers were the same.