THE COST OF MERISTEM LIMITATION IN POLYGONUM-ARENASTRUM - NEGATIVE GENETIC CORRELATIONS BETWEEN FECUNDITY AND GROWTH
THE COST OF MERISTEM LIMITATION IN POLYGONUM-ARENASTRUM - NEGATIVE GENETIC CORRELATIONS BETWEEN FECUNDITY AND GROWTH
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DOI：
10.2307/2409547
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发表时间：
1990-07-01
期刊：
影响因子：
3.3
通讯作者：
GEBER, MA
中科院分区：
文献类型：
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作者：
GEBER, MA
高等植物的生长和繁殖取决于分生组织，分生组织具有三种发育命运。分生组织可以繁殖，但这样做会终止其活动，它可以营养分化，或者可以长时间保持静止状态。前两种命运是相互排斥的，只有第二种命运会导致产生额外的分生组织以供随后的生长和繁殖。在蓼蓼（Polygonum arenastrum）（在北美植物区系中经常被称为 P. aviculare）这种缺乏静止分生组织的一年生物种中，对近交全兄弟家族的定量遗传分析揭示了腋生分生组织对营养生长与繁殖的发育模式的遗传变异。发育变异导致了首次繁殖年龄、特定年龄的繁殖力和生长以及最终植物大小和繁殖产量方面的家庭差异。此外，年龄特异性生长和繁殖力之间存在很强的负遗传相关性。分生组织对繁殖的早期承诺有利于早期的高繁殖力，但减少了可用于营养分化的分生组织的数量，并在分生组织受到限制时导致生命后期的生长率和繁殖力降低。相反，分生组织在生命早期对营养生长的承诺导致早期繁殖力低，但晚期繁殖力和生长高。分生组织限制，就像资源限制一样，是一种在生命史特征之间产生权衡的近似机制。讨论了分生组织限制和资源限制之间的差异。由于生殖分生组织的确定命运，分生组织的限制自动导致衰老的生命史。还发现该自交物种的发育特征与同色异体特征（叶大小、节间长度）和种子大小具有遗传相关性。相关模式暗示了对特定生活史和形态特征的选择。
Growth and reproduction in higher plants depend on meristems, which have three developmental fates. A meristem can become reproductive, but doing so terminates its activity, it can differentiate vegetatively, or it can remain quiescent for extended periods. The first two fates are mutually exclusive, and only the second leads to the production of additional meristems for subsequent growth and reproduction. In Polygonum arenastrum (frequently referred to as P. aviculare in North American Floras), an annual species lacking quiescent meristems, a quantitative genetic analysis of inbred full-sibling families revealed genetic variation in the developmental pattern axillary meristem commitment to vegetative growth versus reproduction. Developmental variation resulted in family differences in the age of first reproduction, in age-specific fecundity and growth, and in final plant size and reproductive output. Furthermore, there were strong negative genetic correlations between age-specific growth and fecundity. Early commitment of meristems to reproduction favors high early fecundity, but reduces the number of meristems available for vegetative differentiation, and leads to lowered growth rates and fecundity later in life, when meristems are limiting. Conversely, meristem commitment to vegetative growth early in life results in low early fecundity but high late fecundity and growth. Meristem limitation, like resource limitation, is a proximate mechanism that generates trade-offs between life history traits. Differences between meristem limitation and resource limitation are discussed. Meristem limitation leads automatically to a senescent life history because of the determinate fate of reproductive meristems. Developmental characters were also found to be genetically correlated with metamer characters (leaf size, internode length) and seed size in this selfing species. The pattern of correlation is suggestive of selection for particular suites of life history and morphological characters.