黄淮麦区高产小麦品种的产量结构及其生理基础的研究

研究了黄淮麦区具有不同产量潜力水平的小麦品种的产量结构及其相关生理基础。结果表明,随着小麦品种由低产型向高产型转变,每穗粒重,每穗粒数,千粒重,收获指数,生物产量均有所增加,其中以收获指数和每穗粒重所起的作用最大;在生理特征上,干物重呈现出拔节期递增、开花期递减、成熟期又表现递增的“Ｎ”型变化曲线,相对生长率的变化也呈同一趋势。旗叶净光合强度及叶绿素含量均呈递增趋势。开花期叶面积指数（ＬＡＩ）则呈

Studies on the Yield Structures and Associated Physiological Basis of High-yielding Winter Wheat Cultivars in Huang-Huai Wheat Region

Thirty-four winter wheat cultivars with diversified yield potentials released in different peneds in Huang-Huai winter wheat region were used to study the changes of yield structures and associated physiological basis following the increase of yield. The results showed that along with the change of cultivar types from low yielding to high yielding,the grain weight/spike,grain numbers/spike, 1000 grain weight, harvest index and yield of biomass all had some increase,but the grain weight/spike and harvest index increased much greater. For the physiological measurements,the dry matter weight showed "N" changing curve,that is,increased at jointing stage,decreased at flowering stage and increased again at ripening stage. The RGR(Relative Growth Rate) showed the similar trend. The NAR and chlorophyll content of the flag-leaf all increased. LAI at flowering stage showed smallest for the low-yielding type,largest for the middle-yielding type and decreased for the high-yielding type, but increased again at the middle of grain filling stage. The bleeding amount of plant of high-yielding type had some increase,too.Discussion was made based on the results.