| 朱雯，张祥宇，李吉跃，王军辉，董蕾，陈俊轩，何茜，章智钊，饶桂香.不同楸树无性系光合特征的比较研究[J].广东农业科学,2013,40(16):57-60 |
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不同楸树无性系光合特征的比较研究 |
| Comparative study on photosynthetic characteristics of different Catalpa bungei clones |
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| DOI： |
| 中文关键词: 楸树 无性系 光合特征 |
| 英文关键词: Catalpa bungei clone photosynthetic characteristics |
| 基金项目: |
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| 摘要点击次数: 1361 |
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| 中文摘要: |
| 采用Li-6400 光合系统对无性系1-3、1-4、004-1、015-1 和7 080 等5 个优良楸树无性系苗期的光合特征进行了研
究，结果表明：（1）5 个楸树无性系的光响应曲线变化趋势大致相同，各无性系Pmax 大小顺序为1-3>7080>015-1>004-1>1-4，无性系1-3 和7080 对光环境适应能力强，其LSP分别为1 147.97、1 196.31μmol/m2.s,而无性系1-4 对光照的适应范围相对最窄；（2）各无性系单位面积净光合日总量存在差异，其中无性系1-4单位面积净光合量最大、为433 974.24 μmol/m2，其次为无性系1-3，其值为401 290.20 μmol/m2；（3）5 个无性系的Tr 与Cond呈现相同的变化趋势，无性系1-3、1-4 和015-1 的Pn 日变化呈现双峰曲线，表现出明显的“光合午休”现象，而无性系004-1 和7080 未出现；（4）综合考虑多种光合特征指标,无性系1-3 光合作用能力相对最优。 |
| 英文摘要: |
| Measurements of photosynthetic characteristics of 5 Catalpa bungei clones (1-3，1-4，004-1，015-1 and 7080) by Li-6400 portable photosynthesis system were indicated that，(1) Light response curves of 5 clones were roughly the same, the maximum net photosynthetic rate (Pmax) was ranked as follows: 1 -3 >7080 >015 -1 >004 -1 >1 -4. Clone 1 -3 and clone 7080 had strong light environmental adaptability, the light saturation point(LSP) of them were 1 147.97 μmol/m2.s and 1 196.31 μmol/m2.srespectively , and clone 1-4 had narrowest range of adaptation to light. (2) Total photosynthetic amount per area of 5 clones were quite different, clone 1-4 was the best(433 974.24 μmol/m2) , and clone 1-3 was the second(401 290.20 μmol/m2). (3)Five clones'trends of tanspiration rate(Tr) were the same as stomatal conductance (Cond), the diurnal variation curves of net photosynthetic rate (Pn) of clone 1-3, 1-4 and 015-1 showed two typical peaks with obvious midday depression, but clone 004-1 and 7080 didn't. (4) Considering a variety of photosynthetic characteristics indicators, photosynthetic capacity of clone 1-3 was the best among 5 Catalpa bungei clones. |
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