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首页> 外文期刊>The New Phytologist >Seasonal variability of dry matter content and its relationship with shoot growth and nonstructural carbohydrates.
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Seasonal variability of dry matter content and its relationship with shoot growth and nonstructural carbohydrates.

机译：干物质含量的季节性变化及其与枝条生长和非结构性碳水化合物的关系。

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摘要

This study assesses how different phases of shoot growth underlie seasonal change in leaf and stem dry matter content (LDMC and SDMC, respectively) of 12 woody Mediterranean species. The relationship between LDMC and nonstructural carbohydrate (NSC) concentrations is also explored and the seasonal vs interspecies variability of LDMC compared. LDMC, SDMC and shoot elongation rate (SER) were measured on a monthly basis for a minimum of 12 months. Bud growth rate (BGR) and NSC concentrations were also assessed in several of the study species. LDMC and SDMC decreased during shoot elongation in spring and increased in summer, showing a significant negative correlation with SER, but were unrelated to BGR. Half of the species analysed showed a positive relationship between LDMC and NSC. Seasonal fluctuations of LDMC within species were higher than interspecies differences, and species ranking was significantly affected by the month of sampling, except during winter months. Seasonal changes in LDMC and SDMC are mainly related to shoot elongation phenology, and NSC sink-source relationships between old and growing organs can explain this relationship in some species. Owing to the high seasonal variability in LDMC, it is recommended that samples for comparative purposes should be collected as close to the winter as possible.
机译：这项研究评估了12个地中海木质物种的茎和茎干物质含量（分别为LDMC和SDMC）的季节变化如何导致芽生长的不同阶段。还探讨了LDMC和非结构性碳水化合物（NSC）浓度之间的关系，并比较了LDMC的季节性与种间变异性。每月至少测量12个月的LDMC，SDMC和枝条伸长率（SER）。在一些研究物种中还评估了芽的生长速率（BGR）和NSC浓度。 LDMC和SDMC在春季枝条伸长过程中下降，而在夏季则增加，与SER显着负相关，但与BGR无关。分析的物种中有一半表明LDMC与NSC之间存在正相关。物种内部LDMC的季节波动高于种间差异，并且除冬季月份外，物种排名受采样月份的影响很大。 LDMC和SDMC的季节变化主要与枝条伸长物候相关，而老龄器官和生长器官之间的NSC汇-源关系可以解释某些物种中的这种关系。由于LDMC的季节性变化较大，建议为比较目的而收集的样品应尽可能接近冬季。

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