CAJ | 학술논문

为探索不同家系北美鹅掌楸的耐淹性差异，采用盆栽苗模拟淹水法对 Louis（L），Kent（K）和Penn（P）3个家系的2年生幼苗进行处理，研究皮孔、膝根、绿叶等指标的变化情况。结果表明：膝根形成是北美鹅掌楸淹水胁迫的应激反应，同一家系随胁迫水位高度的增加膝根长度和粗度分别呈增长和增粗的趋势，不同家系膝根生长量存在差异，L 家系膝根最长、最细，P 家系增粗最快，K家系居中；通气组织皮孔的形成增高了北美鹅掌楸的耐淹性，皮孔数 L 家系＞K 家系＞P 家系；在淹水条件下植株表现为枯死及绿叶数减少，其中 K 家系绿叶数最多，不同家系表现存在差异；水中穿孔根的生长提高了地上／地下部分比值，增加吸氧表面积而提高耐淹性能，是一种应激反应。3个家系耐淹性强弱依次为 L 家系＞K 家系＞P 家系，膝根长度和皮孔数量与北美鹅掌楸耐水能力直接相关。
위탐색불동가계북미아장추적내엄성차이，채용분재묘모의엄수법대 Louis（L），Kent（K）화Penn（P）3개가계적2년생유묘진행처리，연구피공、슬근、록협등지표적변화정황。결과표명：슬근형성시북미아장추엄수협박적응격반응，동일가계수협박수위고도적증가슬근장도화조도분별정증장화증조적추세，불동가계슬근생장량존재차이，L 가계슬근최장、최세，P 가계증조최쾌，K가계거중；통기조직피공적형성증고료북미아장추적내엄성，피공수 L 가계＞K 가계＞P 가계；재엄수조건하식주표현위고사급록협수감소，기중 K 가계록협수최다，불동가계표현존재차이；수중천공근적생장제고료지상／지하부분비치，증가흡양표면적이제고내엄성능，시일충응격반응。3개가계내엄성강약의차위 L 가계＞K 가계＞P 가계，슬근장도화피공수량여북미아장추내수능력직접상관。
In order to explore the different resistance of Liriodendron tulipifera under submergence,the study made 2-year-old potting Liriodendron tulipifera seedling,from 3 families of 3 provenances(Louis (L),Kent (K) and Penn (P))as material and treated by submergence,studied the variation of lenticels,knee roots and leaves of seedlings.The results showed that,knee roots formation was a stress response for Liriodendron tulipifera to adapt to submergence.In a same family,the length and coarseness of knee roots were increased with aggravated submer-gence height,while knee roots increment existed differences in different families,such as knee roots of L family was the longest and thinnest,the thickening of P family was fastest,while K family was in the medium.Lenticel’s formation increased the resistance of Liriodendron tulipifera under submergence,the order of lenticel quantity from high to low were L family,K family and P family.Under submergence condition,plants withered and green leaves reduced,but different families existed differences,and green leaves quantity were the most.The growth of living roots under water improved the ratio of aboveground and underground part,expanded superficial area for oxygen ab-sorbed,and then increased the resistance to submergence,and therefore,it was a stress response.According to in-dex,the order of resistance to submergence in three families was L >K >P.Knee roots length and lenticels quanti-ty were direct correlation with submergence tolerance of Liriodendron tulipifera.