新疆落叶松40个无性系生长及光合特征比较

Comparison of growth and photosynthetic characteristics of 40 clones of Larix sibirica Ledeb.

    摘要
  • 摘要:
    目的 探讨新疆落叶松40个无性系生长特征参数与光合特征参数之间的差异性和相关性，为新疆落叶松良种选育提供参考。
    方法 以新疆落叶松成林期的40个无性系作为研究对象，测定其生长特征、光合特性、光合色素特征等指标参数，进行对比分析和相关性分析。
    结果 新疆落叶松40个无性系生长特征指标、光合特性指标、光合色素特征指标之间均有所差异。其中，YL-10无性系树高最高，为（15.877 ± 1.005） m，YL-25和YL-23无性系胸径均最大，YL-23无性系冠幅最大，但是各无性系主枝数量间均无显著差异性；YL-14无性系Pn和gs均最高，分别为（22.132 ± 0.184） μmol·m−2·s−1、（0.275 ± 0.006） mol·m−2·s−1，YL-27无性系Ci最高，YL-6无性系Tr最高，YL-21无性系WUE最高，其值为（12.828 ± 1.009） μmol·mol−1，YL-1无性系CE最高；YL-35无性系Chla、总叶绿素和Car含量均最高，其值为（1.257 ± 0.210） mg/g、（1.477 ± 0.201） mg/g、（0.280 ± 0.222） mg/g，YL-29无性系Chlb含量最高， YL-34无性系Chla/Chlb最高。相关分析结果得知，新疆落叶松40个无性系生长特征指标、光合特性指标、光合色素特征指标之间均有不同程度的相关性，正相关指标中，Chla与总叶绿素之间的相关性最大，R为0.990，其次为Chla与Chla/Chlb之间的相关性，R为0.763，总叶绿素与Chla/Chlb之间的相关性为第三，R为0.672；负相关指标中，Ci与WUE之间相关性最大，R为−0.754，次之为Tr与WUE之间相关系，R为−0.431，Chlb与Chla/Chlb之间相关性为第三，R为−0.377。
    结论 新疆落叶松40个无性系在生长特征指标、光合特性指标、光合色素特征指标上均存在一定程度的差异性和相关性，因此，在筛选或选育新疆落叶松优良品种过程中应充分考虑这些指标对优良性状的影响。

     

    Abstract:
    Objective To explore the differences and correlations between photosynthetic and growth characteristic parameters of 40 clones of Larix sibirica, in the hope of providing reference for the breeding of high-quality varieties of Larix sibirica.
    Methods 40 mature clones of Larix sibirica were selected as research objects, and their growth characteristic indicators, photosynthetic characteristic indicators and photosynthetic pigment characteristic indicators were measured for comparative analysis and correlation analysis.
    Results There were differences in growth characteristic indicators, photosynthetic characteristic indicators, and photosynthetic pigment characteristic indicators among 40 clones of Larix sibirica. Among them, the YL-10 clone had the highest tree height of (15.877 ± 1.005) m, the YL-25 and YL-23 clones had also the largest diameter at breast height, and the YL-23 clone had the largest crown width. But, there was no significant difference in the number of main branches among the clones. The highest Pn and gs values were observed in the YL-14 clone, with values of (22.132 ± 0.184) μmol·m−2·s−1, (0.275 ± 0.006) mol·m−2·s−1, respectively, YL-27 had the highest Ci, YL-6 had the highest Tr, and YL-21 had the highest WUE, value was (12.828 ± 1.009) μmol/mol, YL-1 had the highest CE. The YL-35 had the highest Chla, total Chl, and Car content, with values of (1.257 ± 0.210) mg/g、(1.477 ± 0.201) mg/g、(0.280 ± 0.222) mg/g, The YL-29 had the highest Chlb content, and the YL-34 had the highest Chla/Chlb. The correlation analysis results showed that, there was varying degrees of correlation between the growth characteristic indicators, photosynthetic characteristic indicators, and photosynthetic pigment characteristic indicators of 40 clones of Larix sibirica. Among the positive correlation indicators, Chla had the highest correlation with total Chl, with a R of 0.990, followed by the correlation between Chla and Chla/Chlb, with a R of 0.763. The correlation between total Chl and Chla/Chlb was the third, with a R of 0.672; Among the negative correlation indicators, the correlation between Ci and WUE was the highest, with an R of −0.754, followed by the correlation between Tr and WUE, with an R of −0.431. The correlation between Chlb and Chla/Chlb was the third, with an R of −0.377.
    Conclusion There are certain differences and correlations in growth characteristic indicators, photosynthetic characteristic indicators, and photosynthetic pigment characteristic indicators among the 40 clones of Larix sibirica. Therefore, in the process of screening or breeding excellent varieties of Larix sibirica, the influence of these indicators on excellent traits should be fully considered.

     

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