Ecological genetics and seed transfer guidelines for Pinus albicaulis (Pinaceae)
Ecological genetics and seed transfer guidelines for Pinus albicaulis (Pinaceae)
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DOI：
10.3732/ajb.95.1.66
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发表时间：
2008-01-01
影响因子：
3
通讯作者：
Aitken, Sally N.
中科院分区：
文献类型：
--
作者：
Bower, Andrew D.;Aitken, Sally N.
白皮松（Pinus albicaulis Engelm.）由于引进疾病、灭火和其他因素，其分布范围内的白皮松（Pinus albicaulis Engelm.）数量大幅下降，预计气候变化将加速这种下降。恢复是必要的；然而，没有关于当地适应程度的信息来指导这些努力。摘要以白皮松为研究对象，通过普通园育苗试验，研究了白皮松生长和适应寒冷的遗传多样性和地理分化（Q(ST)），并确定了反映当地适应的气候变量。对48个群体的幼苗进行了2年的生长，测定了幼苗的高度增长量、生物量、根冠比、冲针日期、秋春冷害和成活率。多数性状在群体间存在显著差异。生长性状的QST较低（0.07 ~ 0.14），冷适应相关性状的QST中等（0.36 ~ 0.47），但因地区而异。冷适应性状与种群起源最冷月份的平均温度密切相关，而生长性状与生长季节长度密切相关。我们建议种子转移有利于种子从较温和的气候向较冷的气候转移，物种范围北部的年平均温度最高为1.9℃，美国落基山脉的年平均温度最高为1.0℃，以避免对当前条件的不适应，同时促进对未来气候的适应。
Whitebark pine (Pinus albicaulis Engelm.) has greatly declined throughout its range as a result of introduced disease, fire suppression, and other factors, and climate change is predicted to accelerate this decline. Restoration is needed; however, no information regarding the degree of local adaptation is available to guide these efforts. A seedling common-garden experiment was employed to assess genetic diversity and geographic differentiation (Q(ST)) of whitebark pine for traits involved in growth and adaptation to cold and to determine climatic variables revealing local adaptation. Seedlings from 48 populations were grown for two years and measured for height increment, biomass, root to shoot ratio, date of needle flush, fall and spring cold injury, and survival. Significant variation was observed among populations for most traits. The QST was low (0.07-0.14) for growth traits and moderate (0.36-0.47) for cold adaptation related traits, but varied by region. Cold adaptation traits were strongly correlated with mean temperature of the coldest month of population origins, while growth traits were generally correlated with growing season length. We recommend that seed transfer for restoration favor seed movement from milder to colder climates to a maximum of 1.9 degrees C in mean annual temperature in the northern portion of the species range, and 1.0 degrees C in the U. S. Rocky Mountains to avoid maladaptation to current conditions yet facilitate adaptation to future climates.