水、热胁迫对花粉活力的影响早有研究,但二者对花粉活力的影响程度尚不清楚。当温度高于38℃时花粉活力下降(Johnson等,1981)。但植株低水势(妒w)未必对花粉活力有影响(Herrero等,1981)。几乎没人估计过低(?)w下玉米的受精能力。最近Westgate(1984)发现,果穗受精能力随花丝(?)w下降而降低。当花丝和果穗叶的(?)w分别为—1.2和—1.8兆帕时,果穗结实严重受阻。但此结论仅在一种环境(控制室)下获得,加之参试基因型也只有一个。若提出一种能更深入理解对高温和亏水的不同耐 The effects of water and heat stress on pollen viability have been studied for a long time, but the influence of both on pollen vitality is not yet clear. Pollen viability decreased at temperatures above 38 ° C (Johnson et al., 1981). However, plant low water potential (jealous w) may not affect pollen viability (Herrero et al., 1981). Few people estimate the fertility of maize under too low (?) W. Recently, Westgate (1984) found that the ear fertilization ability decreases with the decrease of the filament (?) W. Ear rotation was severely hampered when (?) W of filaments and ear leaves were -1.2 and -1.8 MPa, respectively. However, this conclusion was obtained in only one environment (control room), and there was only one genotype tested. If you come up with a more in-depth understanding of the high temperature and water loss of different resistance