Thermal Adaptation ofPennisetum: Seedling Development
Thermal Adaptation ofPennisetum: Seedling Development
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狼尾草的热适应：幼苗发育
DOI：
10.1071/pp9750413
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发表时间：
1975
期刊：
影响因子：
--
通讯作者：
C. Pearson
中科院分区：
文献类型：
--
作者：
C. Pearson
在33/28 ~ 15/10°C（昼/夜）的4种温度下，研究了2个狼尾草品种和1个狼尾草×紫狼尾草生物型幼苗在自然光照条件下的萌发、成苗、干物质积累和叶片发育。发芽率与温度无关。然而，在叶面积扩展速率和干重积累速率最大的温度下，即33/28°C，发芽和出苗速率最快，发芽时间在种群中的传播最少，幼苗存活率最高。三种狼尾草的干重积累速率不同，在低于33/28°C的温度下早期生长的排序与种子大小的排序相同，在所有温度下后期生长的排序为种间杂种>种内杂种>选择株。
Germination, establishment, dry weight accumulation and leaf development of seedlings of two Pennisetum typhoides cultivars and a P. typhoides × P. purpureum biotype were studied at four temperatures from 33/28 to 15/10°C (day/night) under natural irradiances. Percentage seedling germination was independent of temperature. However, rate of germination and emergence were fastest, the spread in populations of time to germination least, and seedling survival highest, at the temperature at which rates of leaf area expansion and dry weight accumulation were greatest, i.e. 33/28°C. Rates of dry weight accumulation differed between the three pennisetums, the ranking in early growth at temperatures below 33/28°C being the same as that for seed size, and in later growth at all temperatures being in the order interspecific hybrid > intra-specific hybrid > selected strain.