CAJ | 학술논문

为了探讨杨树苗对干旱胁迫的适应能力，通过盆栽试验，研究了不同干旱胁迫处理对杨树苗生长、生物量分配、光合色素以及内源激素的影响。结果表明：在中度和重度胁迫下，杨树苗的基径、株高、叶片数和总叶面积均显著低于对照，而在轻度胁迫下的基径和株高与对照差异不显著。随着胁迫强度的增加，叶、茎和根的干质量、胁迫指数和总干质量逐渐降低，而根/冠比显著升高；叶的分配指数逐渐降低，根的逐渐升高。叶绿素（ Chla、Chlb和Chl（a＋b））及类胡萝卜素（Car）均随着干旱胁迫增强而呈减小趋势，但Chla/Chlb和Chl/Car的变化趋势相反。生长素、赤霉素和玉米素随着胁迫强度的加剧逐渐降低，而脱落酸先升高后降低。综合分析认为，杨树苗在轻度水分胁迫下具有较强的形态和生理适应性，而在中度和重度胁迫下明显减弱。
위료탐토양수묘대간한협박적괄응능력，통과분재시험，연구료불동간한협박처리대양수묘생장、생물량분배、광합색소이급내원격소적영향。결과표명：재중도화중도협박하，양수묘적기경、주고、협편수화총협면적균현저저우대조，이재경도협박하적기경화주고여대조차이불현저。수착협박강도적증가，협、경화근적간질량、협박지수화총간질량축점강저，이근/관비현저승고；협적분배지수축점강저，근적축점승고。협록소（ Chla、Chlb화Chl（a＋b））급류호라복소（Car）균수착간한협박증강이정감소추세，단Chla/Chlb화Chl/Car적변화추세상반。생장소、적매소화옥미소수착협박강도적가극축점강저，이탈락산선승고후강저。종합분석인위，양수묘재경도수분협박하구유교강적형태화생리괄응성，이재중도화중도협박하명현감약。
For assessing the ability of water stress about poplar seedlings, a pot experiment was conducted to investigate the effects of water stress on growth, biomass production and partitioning, photosynthetic pigment and endogenous hormone of one-year-old poplar seedlings .The poplar seedlings are influenced under different water stress conditions .Compared to the control, the basal diameter, height, leaf number and total leaf decrease significantly under either moderate or severe stress, while the basal diameter and height have no significant differences with the control under light stress.With the in-creasing extent of water stress, the dry weight, water stress index (WSI) and total dry weight decrease gradually, howev-er, the root/shoot (R/S) increases significantly.The partitioning index of leaf decreases, but that of root increases gradu-ally.The contents of chlorophyll a (Chla), chlorophyll b (Chlb), chlorophyll (a+b) and carotenoid (Car) decrease sig-nificantly, but the ratio of Chla/b and Chl/Car have an inverse trend with the increasing intensity of water stress.IAA, GA and ZT contents decrease consistently ,while ABA content has the trend of first up and then down with the increasing extent of water stress.Therefore, the poplar seedlings have strong morphological and physiological adaptations under light water stress, but would be weakened significantly under both moderate and severe water stress.