DIURNAL CYCLE OF HEAT RESISTANCE IN PLANTS.
DIURNAL CYCLE OF HEAT RESISTANCE IN PLANTS.
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DOI：
10.1126/science.89.2320.556-a
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发表时间：
1939-06-16
期刊：
影响因子：
--
通讯作者：
Laude, H H
中科院分区：
文献类型：
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作者：
Laude, H H
在包括玉米、小麦、大麦、高粱和苜蓿在内的大田作物物种中观察到了植物耐热性的日循环，这在文献中似乎没有报道。每天最大的耐热性在中午左右达到，并在下午继续。最小的抵抗发生在清晨。电阻随光照的增加而增加，无光照时则降低。正常夜晚黑暗后一小时的光照产生可测量的电阻，通常在暴露于日光后四小时内达到每日最大值。在夜间暴露于电灯下的植物在清晨比在黑暗中过夜的植物具有更大的耐热性。在黑暗中失去抵抗力的速度比在有光的情况下获得抵抗力的速度要慢。提出了可能的解释，并正在进一步研究。R.O.W.
A daily cycle of heat resistance in plants which does not appear to have been reported in the literature has been observed in species of field crops including corn (maize), wheat, barley, sorghum and alfalfa. Daily maximum resistance to heat was attained at about mid-day and continued during the afternoon. Minimum resistance occurred early in the morning. Resistance increased with exposure to light and decreased in the absence of it. One hour of light following normal night darkness produced a measurable resistance, and the daily maximum was generally reached within four hours after exposure to daylight. Plants exposed to electric light during the night had a greater resistance to heat in the early morning than those in darkness all night. The loss of resistance when exposed to darkness was slower than the gain in the presence of light. Possible explanations are suggested and are receiving further study.-R.O.W.