This study was carried out to evaluate the changes in silk activity of two corn cultivars Xundan 518 and Yongyou 618 after silk emergence. Artificial pollination was conducted at different days after silk emergence, a...This study was carried out to evaluate the changes in silk activity of two corn cultivars Xundan 518 and Yongyou 618 after silk emergence. Artificial pollination was conducted at different days after silk emergence, and the ear length, ear diameter,barren tip length, 100-grain weight, grain number per ear and grain weight per ear were measured at harvest. The results showed that with the delay of pollination, the number and weight of grains per ear increased at first, peaked at D2 to D4, and decreased subsequently; ear diameter and 100-grain weight showed a downward trend. Correlation analysis revealed that grain number per ear and grain weight per ear were most closely correlated. Rapid silk extrusion and long-lasting silk activity proved that the two corn cultivars Xundan 518 and Yongyou 618 are tolerant to high temperature.展开更多
为明确花期弱光对玉米穗粒数的影响规律，采用人工遮光模拟弱光胁迫，设置抽雄始期和吐丝期持续10 d 60%和90%两个不同遮光强度的弱光处理，研究了花期弱光对雌穗小花受精、结实，干物质积累及其向雌穗分配的影响。结果发现，花期弱光...为明确花期弱光对玉米穗粒数的影响规律，采用人工遮光模拟弱光胁迫，设置抽雄始期和吐丝期持续10 d 60%和90%两个不同遮光强度的弱光处理，研究了花期弱光对雌穗小花受精、结实，干物质积累及其向雌穗分配的影响。结果发现，花期弱光胁迫导致玉米地上部总干物质日增重量降低，干物质分配到雌穗的比例减少，雌穗生长变慢，受精结实率降低，影响程度随遮光率的增加而增大。抽雄始期60%和90%遮光处理10 d后恢复自然光照结实率较处理结束时的受精率均明显提高，吐丝期60%和90%遮光处理10 d后恢复自然光照结实率较处理结束时的受精率降低和持平。抽雄始期光照不足导致穗粒数较对照下降57%-91%；吐丝始期光照不足导致穗粒数较对照下降43%-81%。无论对于抽雄始期还是吐丝期，遮光处理期间的日平均光合有效辐射强度在穗粒形成中作用最大，其次为处理期间的地上部总干物质日增重。对于吐丝期，处理期间的日平均温度对穗粒数也具有直接的正效应。展开更多
基金Supported by Major Science and Technology Project of Henan Province(161100110500-0104)Special Fund for Meteorologicalscientific Research in the Public Interest(GYHY201406026)
文摘This study was carried out to evaluate the changes in silk activity of two corn cultivars Xundan 518 and Yongyou 618 after silk emergence. Artificial pollination was conducted at different days after silk emergence, and the ear length, ear diameter,barren tip length, 100-grain weight, grain number per ear and grain weight per ear were measured at harvest. The results showed that with the delay of pollination, the number and weight of grains per ear increased at first, peaked at D2 to D4, and decreased subsequently; ear diameter and 100-grain weight showed a downward trend. Correlation analysis revealed that grain number per ear and grain weight per ear were most closely correlated. Rapid silk extrusion and long-lasting silk activity proved that the two corn cultivars Xundan 518 and Yongyou 618 are tolerant to high temperature.
文摘为明确花期弱光对玉米穗粒数的影响规律，采用人工遮光模拟弱光胁迫，设置抽雄始期和吐丝期持续10 d 60%和90%两个不同遮光强度的弱光处理，研究了花期弱光对雌穗小花受精、结实，干物质积累及其向雌穗分配的影响。结果发现，花期弱光胁迫导致玉米地上部总干物质日增重量降低，干物质分配到雌穗的比例减少，雌穗生长变慢，受精结实率降低，影响程度随遮光率的增加而增大。抽雄始期60%和90%遮光处理10 d后恢复自然光照结实率较处理结束时的受精率均明显提高，吐丝期60%和90%遮光处理10 d后恢复自然光照结实率较处理结束时的受精率降低和持平。抽雄始期光照不足导致穗粒数较对照下降57%-91%；吐丝始期光照不足导致穗粒数较对照下降43%-81%。无论对于抽雄始期还是吐丝期，遮光处理期间的日平均光合有效辐射强度在穗粒形成中作用最大，其次为处理期间的地上部总干物质日增重。对于吐丝期，处理期间的日平均温度对穗粒数也具有直接的正效应。
