Page 6 - 《广西植物》2026年第7期
P. 6

1 1 0 2                                广  西  植  物                                         46 卷
                 ( Guangxi Laboratory of Forestryꎬ Guangxi Key Laboratory of Superior Timber Trees Resource Cultivationꎬ Guangxi Pinus massoniana
                         Research Center of Engineering Technologyꎬ Guangxi Forestry Research Institute ꎬ Nanning 530002ꎬ China )

                 Abstract: To investigate the variation characteristics of needle volatile components in seedlings from drought ̄resistant and
                 drought ̄sensitive Pinus massoniana families under drought stressꎬ this study used solid ̄phase microextraction ̄gas
                 chromatography ̄mass spectrometry to determine the components and relative contents of needle volatiles in drought ̄resistant
                 and drought ̄sensitive P. massoniana seedlings at different stages (normal cultivationꎬ mild droughtꎬ severe droughtꎬ and
                 drought rewatering). The results were as follows: (1) Sixteen kinds of volatile components from pine needles of P.
                 massoniana seedlings were detected and identifiedꎬ including five monoterpenes (α ̄pineneꎬ β ̄pineneꎬ myrceneꎬ limoneneꎬ
                 and terpinolene )ꎬ nine sesquiterpenes ( γ ̄elemeneꎬ copaeneꎬ β ̄elemeneꎬ longipineneꎬ caryophylleneꎬ humuleneꎬ
                 α ̄muuroleneꎬ γ ̄muuroleneꎬ and δ ̄cadinene) and two esters (linalyl formate and bornyl acetate). (2) The components of
                 needle volatiles in seedlings of drought ̄sensitive and drought ̄resistant P. massoniana families were basically the sameꎬ and
                 mainly composed of monoterpenes and sesquiterpenesꎻ the compounds with relatively high relative contents included
                 α ̄pineneꎬ β ̄pineneꎬ caryophylleneꎬ etc.ꎬ and there was no significant differences between the relative contents of the main
                 components (relative content greater than 1%). (3) Under mild drought stressꎬ the relative contents of monoterpene
                 components in needle volatiles of sensitive families decreased sharplyꎬ in which the relative contents of α ̄pinene and β ̄
                 pinene decreased from 39.671% and 14.383% in the normal cultivation state to 16.855% and 5.048%ꎬ respectivelyꎻ under
                 drought stressꎬ the relative contents of monoterpenes in needle volatiles of drought ̄resistant families decreased (the decline
                 range was much smaller than that of drought ̄sensitive families)ꎬ and the relative contents of monoterpenes increased after
                 drought rewateringꎬ tending to return to the normal cultivation state. (4) The relative contents of volatile components in pine
                 needles of drought ̄resistant P. massoniana seedlings changed little under drought stressꎬ while those of volatile components
                 of pine needles of drought ̄sensitive P. massoniana seedlings changed sharply in the early stage of drought to adapt to
                 external stressꎻ the response of monoterpene components (α ̄pinene and β ̄pinene) in needles to drought stress was the most
                 significant difference between drought ̄sensitive and drought ̄resistant families. This study lays a foundation for the study of
                 the mechanism of P. massoniana needle volatiles in response to drought stressꎬ and provides ideas for P. massoniana
                 drought resistance breeding.
                 Key words: Pinus massonianaꎬ drought stressꎬ volatilesꎬ componentꎬ relative content




                马尾松(Pinus massoniana) 是广泛分布于我国                 松苗木生理响应方面ꎬ研究人员围绕干旱胁迫下
            南方的用材和树脂兼用树种ꎬ具有速生、丰产、耐                             苗木光合特性及相关生理指标的变化展开了深入
            贫瘠等优良特性ꎬ在工业用材、林产品加工、森林                             探讨ꎮ 从光合速率、气孔导度、蒸腾作用ꎬ以及脯
            资源发展及生态服务功能中具有不可替代的作用                              氨酸含量、可溶性糖含量、丙二醛含量等生理指标
            (杨章旗ꎬ2015ꎻ杨章旗等ꎬ2018)ꎮ 作为马尾松主                       入手ꎬ分析了干旱胁迫对马尾松苗木生理代谢的
            要产区之一ꎬ广西因地形条件与季风活动等因素                              影响ꎬ为理解马尾松的抗旱生理机制提供了重要
            的综合作用ꎬ容易出现降雨量时空分布不均的情                              依据(王好运等ꎬ2018ꎻ胡晓健等ꎬ2020ꎻ邓秀秀等ꎬ
            况ꎬ从而导致局部灾害性干旱气候的形成( 李耀先                            2020ꎻ张金凤等ꎬ2021)ꎮ 在生物调控措施方面ꎬ菌
            等ꎬ2009ꎻ邹成林等ꎬ2019)ꎮ 干旱不仅会严重降低                       根化对马尾松苗木抗旱能力的促进作用与机理成
            马尾松的造林成活率ꎬ导致大量苗木死亡ꎬ造成巨                             为研究热点ꎬ菌根能够通过改善苗木根系吸收水
            大的经济损失ꎬ还会显著制约林木的生长速度ꎬ使                             分和养分的能力、调节苗木体内的激素平衡等途
            马尾松的成材周期延长ꎬ进一步影响其在工业用                              径ꎬ有效提高马尾松苗木的抗旱性ꎬ为马尾松抗旱

            材与生态服务等方面的功能发挥ꎮ                                    造林提供了新的技术思路( 王艺等ꎬ2019ꎻ王艺和
                 目前ꎬ研究人员对马尾松的抗旱研究已取得                           涂桂英ꎬ2021ꎻ李敏等ꎬ2022)ꎮ 此外ꎬ研究人员通
            了一定的进展ꎬ研究方向主要集中在光合特性、生                             过苗期干旱试验和大田试验对不同种源( 刘建兵
            理指标、生物调控、抗性筛选等关键领域ꎮ 在马尾                            等ꎬ2010ꎻ韩文萍等ꎬ2012)和不同家系( 杜明凤等ꎬ
   1   2   3   4   5   6   7   8   9   10   11