GROWTH ANALYSIS OF CONGENERIC ANNUAL AND PERENNIAL GRASS SPECIES
GROWTH ANALYSIS OF CONGENERIC ANNUAL AND PERENNIAL GRASS SPECIES
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DOI：
10.2307/2260858
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发表时间：
1992-01-01
影响因子：
5.5
通讯作者：
GARNIER, E
中科院分区：
文献类型：
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作者：
GARNIER, E
1.在恒定的生产条件下，对7对一年生/多年生禾本科植物（6对同源，1对随机）在水培系统中进行生长分析，以研究一年生植物相对生长率（RGR）高于多年生植物的机制.所有的生产参数（RGR，相对产叶率，单位叶率），在一年生植物比多年生植物高。两种生活型的生物量分配到不同器官的差异很小（除了多年生植物鞘的分配较高）。比叶面积和叶面积比在一年生植物中较高，而所有器官的干重：鲜重比在多年生植物中较高。这些差异在一个属内比较时几乎是系统的，而在不同属间比较时则不系统.广泛的RGR obained为14个物种也允许RGR和生长的各个组成部分之间的一般关系进行了讨论。RGR与单位叶率、比叶面积、叶面积比、全株干鲜重比、根干鲜重比呈显著正相关。令人惊讶的是，RGR与任何生物量分配参数都不相关。比叶面积是最能解释相对生长速率差异的单因子.如果像其他地方所假设的那样，一年生生活型是从多年生生活型衍生而来的，那么这里所提出的结果表明，同样的形态变化在不同的属中反复发生。有人认为，这些变化，这可能是相关的解剖特征的差异，主要影响特定的（即每单位重量或面积）的植物器官的吸收能力，导致较高的幼苗生长速度观察到的一年生植物。
1. A growth analysis was conducted on seven annual/perennial pairs of grasses (six congeneric and one pair taken at random) grown in a hydroponic culture system under constant, productive conditions, in order to investigate the mechanisms responsible for the higher relative growth rate (RGR) of annuals as compared to perennials.2. All the production parameters (RGR, relative leaf production rate, unit leaf rates), were higher in annuals than in perennials. There were very few differences between the two life forms in biomass allocation to the different organs (except a higher allocation to sheaths in perennials). The specific leaf areas and the leaf area ratios were higher in annuals, whereas the dry-weight:fresh-weight ratios of all the organs were higher in perennials. These differences between annuals and perennials were almost systematic when the comparisons were made within a given genus, but not when they were made between annuals and perennials in different genera.3. The wide range of RGR obained for the 14 species also permitted general relationships between RGR and the various components of growth to be discussed. RGR was significantly correlated with: (i) unit leaf rate, (ii) specific leaf area, (iii) leaf area ratio, (iv) dry-weight:fresh-weight ratio of the whole plant, and (v) dry-weight:fresh-weight ratio of roots. Surprisingly, RGR was not correlated with any of the biomass allocation parameters. The single factor that best explained the differences in RGR was the specific leaf area.4. If, as has been hypothesized elsewhere, the annual life form is derived from the perennial one, the results presented here suggest that the same morphological changes have occured repeatedly in different genera. It is argued that these changes, which are probably correlated with differences in anatomical features, mainly affect the specific (i.e. per unit weight or area) uptake capacities of the plant organs, leading to the higher seedling growth rate observed in annuals.