胡杨异形叶性状与其个体发育的关系

王文娟; 吕慧; 钟悦鸣; 陈利俊; 李景文; 马青

doi:10.13332/j.1000-1522.20180364

胡杨异形叶性状与其个体发育的关系

Relationship between heteromorphic leaf traits of Populus euphratica and its individual development

摘要

摘要:
目的叶片是植物适应环境的重要器官，叶片结构性状的改变影响植物光合作用等生理过程，探讨胡杨叶形变化规律及其影响因素对理解其适应特性具有重要意义。
方法为明确胡杨异形叶结构性状特征与其个体发育之间的关系，在额济纳人工胡杨林内调查不同树龄、繁殖期与非繁殖期胡杨树冠下层叶片的长与宽以分析其叶形的变化规律。
结果胡杨异形叶形成是一个渐变的过程，随着树龄增加，胡杨叶长减小，叶宽增加，叶长宽比减小；树龄对叶片长、宽和长宽比变异的解释率分别为53.1%、38.6%和66.1%。繁殖期对胡杨叶形变化具有显著影响，6年生胡杨繁殖期叶长和叶长宽比显著小于非繁殖期叶片，而叶宽显著大于非繁殖期叶片。非繁殖期的胡杨叶形则随树龄增加由条形叶向卵形叶逐渐转变。胸径与胡杨叶片形态特征显著相关，随着胸径增大，胡杨叶长与叶长宽比减小，叶宽增大；在一元回归分析中，胸径对胡杨叶片形态特征的解释率均大于0.5(R²>0.5，P < 0.000 1)，而在多元回归中，胸径单独的解释率为8.6%(叶长)、13.1%(叶宽)、3.4%(叶长宽比)；此外，胸径与树龄对胡杨叶片结构性状特征具有显著的交互影响。
结论胡杨异形叶的发生与其个体生长发育之间具有密切关系，随着树木的生长，胡杨叶形由条形叶向卵形、阔卵形叶转变以适应干旱高温的环境；此外，繁殖期加速胡杨叶形的转变，可能是胡杨应对繁殖期能量需求的适应性策略。

Abstract:
ObjectiveLeaf is the most adaptable plant organ responding to the environment. Leaf structure influences plant physiological processes, such as photosynthesis. Thus, it is extremely important to understand the changes in leaf structure and underly factors for exploring the strategy of plant adaptation.
MethodTo detect the relationship between the leaf structural traits of Populus euphratica and its individual development stage, we investigated the leaf length and width of P. euphratica to calculate leaf shape changes during reproduction and non-reproduction period at different ages in Ejina artificial P. euphratica forest of Inner Mongolia.
ResultThe results showed that the leaf length and the ratio of leaf length to leaf width decreased with increasing tree age, while the leaf width increased. Tree age accounted for 53.1%, 38.6% and 66.1% of variations in the leaf length, leaf width and the ratio of leaf length to width, respectively. The leaf shape changes were significantly influenced by reproduction period. Leaf length and ratio of the length to width in reproduction period were significantly smaller while leaf width was larger than those in non-reproduction period. However, the leaves of P. euphratica during non-reproduction period gradually changed from lanceolate to broad-ovate with increased tree age. The DBH was significantly correlated with the leaf traits, which was negatively correlated with the leaf length and the ratio of leaf length to leaf width versus positively correlated with the leaf width. The DBH accounted for most of the variations in the leaf traits by one-dimensional regression analysis (R²>0.5, P < 0.000 1). But DBH accounted for a lower portion of the overall variations of leaf traits based on multiple linear models (leaf length 8.6%, leaf width 13.1%, the ratio of leaf length to width 3.4%). Furthermore, we detected significant interactive effects between DBH and age on the leaf traits.
ConclusionIn conclusion, the leaf traits of P. euphratica were significantly correlated with the tree growth and development. The leaf shape changed from lanceolate to broad-ovate with tree growth to adapt the desert environment. We infer P. euphratica accelerates the leaf shape changes to provide sufficient energy for reproduction which may be an adaptive strategy of P. euphratica to environmental conditions.

HTML全文

参考文献(27)

施引文献

资源附件(0)