温度对不同种源南酸枣叶片性状可塑性的影响

Effect of Temperature on Plasticity of Leaf Traits of Choerospondias axillaris from Different Provenaces

摘要:

性状可塑性是植物适应气候变化的关键，然而，如今对气候因子如何影响植物性状可塑性的认识仍然有限。该研究以14个种源的南酸枣为研究对象，通过同质园实验研究不同种源南酸枣在温度和降水梯度下的叶片性状可塑性。结果表明, 南酸枣叶片性状可塑性为0.034~0.236。不同种源南酸枣性状可塑性在温度梯度表现出显著变异，但除非结构性碳水化合物可塑性外，其他性状可塑性和降水因子无关。其中，叶长可塑性与年均温、最湿季均温和最冷季均温呈显著正相关，叶面积可塑性与年均温和最冷季均温均呈显著正相关，与平均气温日较差呈显著负相关，相对含水率可塑性与年均温和最冷季均温呈显著正相关，非结构性碳水化合物含量可塑性与年均温和最冷季均温呈显著负相关。温度因子对南酸枣性状可塑性有驱动作用，叶片表型可塑性的变异可能是种群在长期进化中对温度变化的主要适应策略。该研究厘清了温度和降水与性状可塑性的关系，可为预测气候变化背景下南酸枣适应性变化以及种质资源保护提供科学参考。

Abstract:

Trait plasticity is the key to plant adaptation to climate change. However, the understanding of how climate factors affect trait plasticity is still limited. In this study, the plasticity of leaf traits in different provenances of 14 Choerospondias axillaris under temperature and precipitation gradient were studied through homogenous garden experiment. The results showed that the leaf trait plasticity of C. axillaris was 0.034-0.236. Trait plasticity among different provenances exhibited significant variation along temperature gradients, but except for leaf non-structural carbohydrate plasticity, the other traits were unrelated to precipitation factors. Specifically, leaf length plasticity was positively correlated with annual mean temperature, mean temperature in the wettest season and the coldest season. Leaf area plasticity was positively correlated with annual mean temperature and mean temperature in the coldest season, which was negatively correlated with mean diurnal temperature range. The plasticity of leaf relative water content was positively correlated with annual mean temperature and mean temperature in the coldest season. The leaf non-structural carbohydrate plasticity was negatively correlated with annual mean temperature and mean temperature in the coldest season. Therefore, the temperature factors limited the trait plasticity of C. axillaris. Moreover, the variation of leaf phenotypic plasticity might be the main adaptive strategy of the population to temperature change during long-term evolution. This study clarified the relationship between temperature and precipitation and trait plasticity, which could provide scientific reference for predicting adaptability change and germplasm resource protection under the background of climate change.