Seedling growth and photosynthetic characteristics of different Sophora moorcroftiana provenances
In order to study the difference on seedling growth and photosynthetic characteristics among Sophora moorcroftiana provenances, the growth characters, chlorophyll content, and curves of light response and CO<sub>2</sub> response were analyzed, using eight provenances of one-year-old seed...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2019-04-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2018.06.011 |
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| Summary: | In order to study the difference on seedling growth and photosynthetic characteristics among Sophora moorcroftiana provenances, the growth characters, chlorophyll content, and curves of light response and CO<sub>2</sub> response were analyzed, using eight provenances of one-year-old seedlings. The results showed that there was a significant difference on the growth and chlorophyll content among the provenances of S. moorcroftiana seedlings (P<0.05). The light response curve showed that the net photosynthetic rate (P<sub>n</sub>) increased as the increasing photosynthetically active radiation (PAR). When the P<sub>n</sub> of eight provenances increased to the top, it decreased irrespective of increasing PAR and represented the single-peak curve, with an obvious photo inhibition phenomenon. The light saturation point (L<sub>SP</sub>) of eight provenances ranged from 740.467 to 1 773.078 μmol/(m<sup>2</sup>·s), and light compensation point (L<sub>CP</sub>) ranged from 1.408 to 43.381 μmol/(m<sup>2</sup>·s). The P<sub>n</sub> and L<sub>SP</sub> of provenances in Linzhou County and Bayi District were higher than these of other provenances. The CO<sub>2</sub> response curve showed that the concentration of CO<sub>2</sub> increased within a certain range. The characteristic parameters of CO<sub>2</sub> curve showed statistical differences among the provenances (P<0.05). The CO<sub>2</sub> saturation point (C<sub>SP</sub>) was between 1 769.632 and 2 678.136 μmol/(m<sup>2</sup>·s) and the CO<sub>2</sub> compensation point (Г) was between 76.155 and 111.430 μmol/ (m<sup>2</sup>·s). Correlation analysis showed that the P<sub>n</sub> was positively correlated with stomatal conductance (G<sub>s</sub>) and L<sub>SP</sub> (P<0.01), and the intercellular CO<sub>2</sub> concentration (C<sub>i</sub>) was significantly correlated with transpiration rate (T<sub>r</sub>), L<sub>CP</sub> and dark respiration rate (R<sub>d</sub>) (P<0.01). Seedling height was significantly correlated with P<sub>n</sub> and the content of chlorophyll (P<0.05). The provenances of Linzhou County and Bayi District had higher P<sub>n</sub>, and their L<sub>SP</sub> were also the highest, which indicated that these two provenances had high photosynthetic potential under the strong light environment. |
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| ISSN: | 1008-9209 2097-5155 |