文冠果不同种源叶片结构对水分胁迫的差异性响应

目的探究不同种源文冠果叶片解剖结构对水分胁迫的响应，了解其耐旱性差异，为节水耐旱型文冠果种源的筛选以及培育提供理论依据。方法以集中分布在华北地区的3个不同种源文冠果幼苗为研究对象，通过盆栽控水方法设置充足水分W1、正常供水W2、轻度干旱W3和重度干旱W4共4个水分梯度，采用石蜡切片技术，研究文冠果叶片解剖结构对水分胁迫的响应。结果随着干旱程度的加剧，3个种源均存在着不同程度的旱生结构；与河南种源相比，山西和河北种源上下表皮、角质层以及叶片结构紧密度(重度干旱)的响应能力更强，不同的是山西种源以较厚的叶肉组织，而河北种源以较发达的维管系统和较高的栅海比来响应干旱胁迫。结论不同种源文冠果的叶片解剖结构对水分胁迫的响应具有明显的差异性，其中山西和河北种源文冠果属于节水耐旱型文冠果种源。 

Differential response of water stress on leaf morphological anatomical structures of varied provenances Xanthocera sorbifolium

ObjectiveBy means of exploring the response of leaf anatomical structure of different yellow horn (Xanthocera sorbifolium) provenances to water stress, this paper aims to understand the difference of drought tolerance, and provide the basis for the selection of water-saving and drought-tolerant provenances.MethodIn this paper, 3 different provenances of yellow horn seedlings distributed in North China were studied, and 4 water gradients including sufficient water W1, normal water supply W2, mild drought W3 and severe drought W4 were set by potted water control method. The anatomical structure of the plant leaf was observed with paraffin section technique.ResultWith the intensification of drought stress, the yellow horn leaves of three provenances all had different degrees of xerophytic structure; compared with the X. sorbifolium of Henan provenances, the upper and lower epidermis, cuticle and leaf structure tightness (severe drought) of Shanxi and Hebei provenances had higher responsiveness. Shanxi provenance with thicker mesophyll tissue, Hebei provenance with more powerful vascular system and the ratio of palisade tissue to sponge tissue responded to drought stress.ConclusionThe response of leaf anatomic structure to water stress is different in varied provenances. The X. sorbifolium of Shanxi and Hebei provenances belongs to water-saving and drought-tolerant type.