Teeri J A
Barnes Laboratory, The University of Chicago, 5630 S. Ingleside Avenue, 60637, Chicago, IL, USA.
Oecologia. 1978 Jan;37(1):29-39. doi: 10.1007/BF00349989.
Two populations of Potentilla glandulosa (Rosaceae) have strongly contrasting abilities to seasonally modify their phenotypic sensitivity to drought by low temperature-induced changes in leaf morphology. One population is native to an inland continental climate with unpredictable droughts occurring at any time during the year. The second population is native to a coastal mediterranean climate with a highly predictable annual cycle of winter rain and summer drought. In response to low temperatures in the autumn, the inland plants produce a compact rosette of small leaves and shed their large summer leaves, thereby reducing the total plant leaf area. The inland plants begin growth in the spring in the compact rosette phenotype and are much less sensitive to drought, maintaining higher values of stomatal conductance and leaf water potential, than when in the largeleaved summer phenotype. The coastal plants do not exhibit the low temperature-induced change in leaf morphology and are relatively sensitive to drought when grown at high or low temperatures. The F hybrids of a coastal x inland cross exhibit an intermediate response to low temperature and drought. In the F generation the inland parental class of individuals fully responding to low temperature segregates in a 1:63 ratio.
两种委陵菜（蔷薇科）种群通过低温诱导的叶片形态变化，在季节性改变其对干旱的表型敏感性方面具有强烈对比的能力。一个种群原产于内陆大陆性气候地区，一年中任何时候都可能出现不可预测的干旱。第二个种群原产于沿海地中海气候地区，有高度可预测的冬雨和夏旱年周期。响应秋季的低温，内陆植物产生紧凑的小叶莲座丛并脱落其大的夏季叶片，从而减少植物的总叶面积。内陆植物在春季以紧凑的莲座丛表型开始生长，并且对干旱的敏感性要低得多，与处于大叶夏季表型时相比，保持较高的气孔导度和叶片水势值。沿海植物没有表现出低温诱导的叶片形态变化，并且在高温或低温下生长时对干旱相对敏感。沿海×内陆杂交的F代杂种对低温和干旱表现出中间反应。在F代中，完全响应低温的内陆亲本类型个体以1:63的比例分离。
