| 杨妙丹,戚建华.外来植物田菁种子特性及其萌发对酸碱胁迫的响应[J].林业调查规划,2026,51(2):154-159 |
| 外来植物田菁种子特性及其萌发对酸碱胁迫的响应 |
| Seed Characteristics of the Alien Plant Sesbania cannabina and Its Germination Response to Acid-Alkaline Stress |
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| DOI： |
| 中文关键词: 田菁 入侵物种 异型性种子 酸碱胁迫 抗逆性 |
| 英文关键词: Sesbania cannabina invasive species heteromorphic seeds acid-alkali stress stress resistance |
| 基金项目:林学学科和重点实验室开放基金项目(LXXK-2025M15). |
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| 摘要点击次数: 311 |
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| 中文摘要: |
| 田菁作为绿肥植物引入我国,现已被划入外来入侵植物。研究田菁种子长宽、质量及其在酸
碱胁迫下的萌发特性与幼苗生长情况。结果表明,田菁具有异型性种子,分别为种皮呈红棕色、易吸水、质量轻的扁圆柱形种子(A型种子)和种皮褐绿色、难吸水、质量重的圆柱形种子(B型种子)。田菁A、B型种子在pH2~12的酸碱梯度中平均萌发率均超过50%,均在第2天进入萌发高峰期。pH4~6处理下田菁A、B型种子的幼苗胚根、下胚轴长和重量显著高于pH10~12处理,随pH 升高总体呈先升后降的倒“V”形变化,除pH2处理外,其余胁迫处理下幼苗重量无显著差异,表明其种子萌发的幼苗均可通过调节胚根和下胚轴生长,改变个体形态特征以适应环境胁迫策略。田菁在广西偏酸性土壤中存在迅速扩散成为更高等级入侵植物的潜在风险。 |
| 英文摘要: |
| Sesbania cannabina, originally introduced to China as a green manure plant, is now classified as an invasive alien species. This study investigated the seed length, width, and mass of S.cannabina, as well as its germination characteristics and seedling growth under acid-alkali stress. The results indicated that S.cannabina produced heteromorphic seeds: Type A seeds were reddish-brown, oblate-cylindrical, readily absorb water, and had a lighter mass, while Type B seeds were brown-green, cylindrical, difficult to absorb water, and had a heavier mass. Under a pH gradient ranging from 2 to 12, the average germination rate for both seed types exceeded 50%, with a germination peak occurring on the second day. Seedling radicle and hypocotyl length, as well as weight, were significantly greater under pH4-6 treatments compared to those under pH10-12 treatments. Overall, these growth parameters followed an inverted “V”-shaped pattern, initially increasing and then decreasing with rising pH. Apart from the pH2 treatment, seedling weight under other stress treatments showed no significant differences, suggesting that the seedlings can adapt to environmental stress by modulating radicle and hypocotyl growth to alter morphological traits. The study concludes that S.cannabina holds a high potential risk for rapid expansion and escalation to a higher invasion level in the acidic soils of Guangxi. |
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