冬小麦品种河农859和河农326的光合性能 与子粒产量对水分的反应

以田间种植的河农８５９和河农３２６为材料，比较了需水特性不同的２个冬小麦品种的光合性能和子粒产量。结果表明，叶片的光合速度一般以河农８５９较高，但在刚灌水后的短时间内则以河农３２６的光合速率较高；河农８５９叶片光合速率受灌水的影响较小，在生育期间的变化较平衡，而河农３２６灌水与不灌水的处理间光合速率差别较大，且光合速率的波动明显。从产量性状分析，开花后灌１次水和不灌水的极水条件下以河农８５９产量较高，表明期耐旱性较强，而开花后保证充分供水的湿润处理则以河农３２６产量较高，且增产幅度较大，因此，河农８５９适宜在供水有极的条件下发挥其耐旱特性，争取较高产量，而河农３２６可用于供水充足条件下发挥高产潜力。

Responses of photosynthetic performance and grain yield to water supply in winter wheat cultivars Henong 859 and Henong 326

In this paper, photosynthetic performance and grain yield of two winter wheat cultivars, Henong 859 and Henong 326, which had different water-requiring property, were compared under field conditions. The main results were that leaf photosynthetic rate (Pn) in Henong 859 was higher than that in Henong 326 for most determinations, but it was higher in Henong 326 during the short period immediately after irrigation. Leaf Pn in Henong 859 was less influenced by irrigation and kept more even fluctuations during growing period, but in Henong 326, greater differences of Pn existed between irrigation treatments and the fluctuations of Pn during growing period were more dramatic. Under limited post-anthesis irrigation conditions, Henong 859 had higher yield, showing its stronger drought tolerance, but with sufficient post-anthesis water supply, the yield of Henong 326 was higher than Henong 859, and the yield was significantly higher comparing with those under limited irrigation. According to the above results, Henong 859 is suitable to give higher yield under limited water supply conditions due to its drought tolerance, but Henong 326 is suitable for non-limited water conditions to show its high yield potential.