Is bi-seasonal germination an optimal choice for an ephemeral plant living in a cold desert
Is bi-seasonal germination an optimal choice for an ephemeral plant living in a cold desert
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对于生活在寒冷沙漠中的短暂植物来说，双季节发芽是最佳选择吗？
DOI：
10.1007/s40333-019-0001-1
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发表时间：
2019
影响因子：
3
通讯作者：
Wei Pang
中科院分区：
文献类型：
--
作者：
Shanlin Yang;Xiang Shi;Shaoming Wang;Jiashu Liu;Fanxiang Meng;Wei Pang
萌发策略的研究已被提出作为一种工具，了解生活在极端气候条件下的植物物种的进化模式。以往的研究主要集中在春季萌发的植物上，而对秋季和春季同时萌发的短命植物的生态学意义研究较少。研究了角茴香秋、春萌发植株的生物学特性及生活史对策。2016年至2017年，对中国古尔班通古特沙漠南部的罂粟科Hypecoumin植物进行了调查。结果表明：（1）秋发植物从出苗到生活史结束的间隔（2）秋发植株的株高、冠幅、主轴和叶片数均显著大于春发植株;（3）秋、春萌发植株干物质对生殖的分配分别为30.24%（±2.41%）和10.12%（±0.68%）。秋发苗在避免一年生和多年生草本植物之间的竞争方面，直立草本植物具有优势，这些草本植物具有较长的营养生长期。只有极少数秋发苗成功越冬时，春发苗才能保证种群的存活。在不可预测的环境中，赌注对冲的萌发策略既能充分利用资源，降低后代的竞争强度，又能保证植物种群的生存。
Research on germination strategies has been proposed as a tool for understanding the evolutionary patterns of plant species living in extreme climate conditions. Previous research has concentrated on spring-germinated plants, while there has been little investigation on the ecological significance of ephemeral plants that germinate in both autumn and spring. The biological characteristics and life history strategies of autumn- and spring-germinated plants ofHypecoum erectumL. that belongs toHypecoumin Papaveraceae family in the southern part of the Gurbantunggut Desert, China, were investigated from 2016 to 2017. Results showed that: (1) the interval from seedling emergence to the end of the life cycle in autumn-germinated plants (202–208 d) was significantly longer than that in spring-germinated plants (53–65 d); (2) the height, crown, principal axis and the number of leaves of autumn-germinated plants were much greater than those of spring-germinated plants; (3) allocation of dry mass to reproduction was 30.24% (±2.41%) and 10.12% (±0.68%) in autumn- and spring-germinated plants, respectively. Autumn-germinated seedlings ofH. erectumhad an advantage in avoiding the competition between annual and perennial herbs that had longer periods of vegetative growth. Spring-germinated seedlings need to ensure the survival of population when only a fewer autumn-germinated seedlings successfully overwinter. In an unpredictable environment, the germination strategy of bet hedging not only utilizes the resources and reduces the competition intensity in offspring, but also ensures the survival of the plant population.