Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Melia azedarach is widely distributed in China and has a wide range of genetic variation. In order to study the growth characters of 1-year-old seedlings of M. azedarach from different seed sources, the growth characters of seedling height, ground diameter, compound leaf growth and biomass accumulation of M. azedarach seedlings from 15 seed sources were observed, and the growth rhythm was fitted by logistic equation. The results were as follows: (1) There were significant differences in seedling height, ground diameter, root biomass, stem biomass and compound leaf correlation between different habitats(P<0.05 or P<0.01). (2) The growth of seedling heights and ground diameters showed a slow-fast-slow growth pattern with type S. Compared with the emergence time of seedling height growth peak, the emergence time of ground diameter growth peak was later. (3) The R2 of logistic fitting equation was 0.976-0.994, which reached the highly significant correlation level, indicating that the growth rhythm of M. azedarach could be fitted by logistic equation. (4) According to theoretical calculation and practical observation, the duration of fast-growing stage of ground diameter was generally 20-30 d longer than that of high-speed growth stage of seedling. The time of seedling heights and ground diameters entering fast-growing stage and ending fast-growing stage in northern locality was earlier than that in southern locality. The cumulative growth of seedling height and ground diameter in fast-growing stage was more than 60% of the total growth.（5）All though traits were negatively correlated with latitude, seedling height, biomass of root and leaf area were positively correlated with longitude, the other traits were negatively correlated with longitude. In general, M. azadarach begongs to full-time growth type with significant differences in growth traits among seed sources. The growth was regulated by latitude and longitude, mainly by latitude .
Subjects: Biology >> Botany >> Applied botany submitted time 2020-03-24 Cooperative journals: 《广西植物》
Abstract：为探索苦楝应对盐胁迫的响应机制和为苦楝在盐碱地区的推广应用提供理论参考。该研究以一年生苦楝（Melia azedarach）实生苗为材料，在盆栽条件下设置中性盐Na2SO4和碱性盐Na2CO3 3个盐浓度（200、400和600 mmol·L-1）处理40 d，研究苦楝的抗盐碱水平及在不同程度盐碱胁迫条件下的生长及光合生理变化。结果表明，随着盐浓度的提高，苦楝的苗高、地径和生物量的增长量均呈现下降趋势，且碱性盐胁迫条件下降程度更大，盐胁迫提高苦楝的根冠比。处理10 d时，苦楝幼苗的所有光合指标随中性盐和碱性盐浓度的提高呈相似的下降特征，碱性盐胁迫条件下的降低幅度显著大于中性盐胁迫，且随处理时间的增加，中性盐和碱性盐处理下苦楝幼苗的净光合速率和蒸腾速率显著降低。随着盐浓度的提高，苦楝的叶绿素含量呈现下降趋势，200 mmol·L-1盐胁迫对叶绿素含量影响较小，400和600 mmol·L-1盐碱胁迫均对叶绿素含量有显著影响。600 mmol·L-1碱性盐胁迫条件下，苦楝叶片相对电导率和饱和水分亏缺最高，显著高于其余处理。同等浓度下，碱性盐胁迫的苦楝叶片相对电导率和饱和水分亏缺显著高于中性盐胁迫处理。由此可见，苦楝具有一定的耐盐碱能力，碱性盐比中性盐对苦楝幼苗的影响更大。
Subjects: Biology >> Botany >> Applied botany submitted time 2019-06-17 Cooperative journals: 《广西植物》
Abstract：该研究以苦豆子自然分布的内蒙、宁夏、甘肃、新疆、陕西等23 个不同地理来源（种源）的野生苦豆子种子及其播种于内蒙古鄂托克前旗同质园内的当年生植株为材料，采用方差分析、主成分分析、聚类分析等方法对种子长、宽、千粒重以及植株的叶长、叶宽、叶面积、叶形指数、苗高、地径及生物量等10 个表型性状的多样性进行了研究，结果如下：各个表型性状种源间均呈极显著差异，其中种子表型性状的变异系数为5.24%，植株表型性状的变异系数为18.34%，表明种子性状的稳定性高于植株性状。同时，10 个性状的表型分化系数均高于70%，说明苦豆子表型多样性主要来源于种源间的表型变异；各种源苦豆子种子性状的表型分化系数均值高达97.55%，且种长、千粒重分别与采集地经度、海拔和纬度等环境因子呈极显著相关性，说明种子表型性状受环境因素的影响较大；相关性分析则显示，苦豆子植株性状LL、LA 分别与种子性状TW、SL 和SW 有显著相关性，暗示表型性状中的可遗传变异影响；利用主成分和聚类分析对23 个种源苦豆子进行综合评价，筛选出生物量较大、苗高较高、千粒重较重、叶面积较大等综合表现较好的6 个种源，共分为两类，它们分别是DK、JY、WY、WH 和ETK 及YN，这为苦豆子种质资源定向开发及选育、栽培提供了一定的理论支撑和基础材料。
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