覆草对苹果叶片显微结构及光系统功能的影响  

Effects of Orchard Mulching Grass on the Microstructure and Function of Photosystem in Apple Leaves

作　　者：吕三三[1] 杜国栋[1,2] 刘志琨[1] 吕德国[1,2] 李爽[1] 

机构地区：[1]沈阳农业大学园艺学院,沈阳110866 [2]沈阳农业大学北方果树育种与生理生态研究所,沈阳110866

出　　处：《中国农业科学》2015年第1期130-139,共10页Scientia Agricultura Sinica

基　　金：国家现代苹果产业技术体系专项(CARS-28);辽宁省教育厅辽教发(201036-11);辽宁省科技攻关项目(2011215006)

摘　　要：【目的】探究渤海湾北部冷凉苹果产区,果园覆草管理措施对苹果叶片光合机构及生理功能的影响机制,为果园有机覆盖措施提供理论依据。【方法】以2年生‘寒富’苹果/GM256/山定子为试材,当地自然生长的马唐草(Digitaria sanguinalis(L.)Scop.)为覆盖材料,设覆草处理(1 kg草/盆,C1N0),施用氮肥处理(3.4g尿素/盆,C0N1),覆草+氮肥处理(1 kg草+3.4 g尿素/盆,C1N1)和对照(CK)4个处理,通过盆栽试验模拟果园覆草的土壤管理措施,研究覆盖草残体及配施氮肥各处理对苹果叶片的显微结构、光合色素含量、叶片气体交换参数及光合机构整体功能的影响。【结果】与对照相比,盆栽条件下覆草配施氮肥各处理对苹果叶片显微结构产生影响,其中单独覆草处理及施氮肥处理均可以增加栅栏组织的厚度和栅栏组织/海绵组织的比值,但两处理叶片的海绵组织厚度、叶片厚度与对照差异不显著;覆草+氮肥处理的苹果叶片栅栏组织厚度、海绵组织厚度和叶片厚度分别较对照增加8.45%、12.91%和19.34%,明显提高了叶片栅栏组织/海绵组织的比值。覆草处理可改变叶片的叶绿素含量、叶绿素组分比例和光合气体交换参数,其中叶绿素a含量、总叶绿素含量、叶绿素a/b和叶片净光合速率(Pn)分别提高22.67%、12.71%、23.42%和22.83%;施氮肥处理与覆草+氮肥处理的叶片光合色素含量和光合生理参数高于覆草处理及对照水平,后者的叶绿素a含量、叶绿素b含量和总叶绿素含量分别是对照的1.42、1.04和1.37倍,叶片的净光合速率(Pn)和水分利用效率(WUE)也分别较对照增加41.71%和21.99%。各处理叶片的叶绿素荧光诱导动力曲线和820 nm光吸收曲线出现较为明显变化,经JIP-test荧光数据分析表明,最大光化学效率(Fv/Fm)、捕获的激子将电子传递到电子传递链中QA下游其他电子受体的概率(ψo)和PSⅡ反应中心吸收的光能用于电子传�[Objective] The influencing mechanisms of orchard mulching grass on the photosynthetic apparatus as well as the physiological function of apple leaves in the northern of the Bohai Gulf were studied in order to provide a theoretical basis for organic cover measures in orchard. [Method] ‘Hanfu’ apple （Malus domestica Borkh./GM256/M.baccata Borkh.） and Digitaria sanguinalis （L.） Scop. were used as materials, a potted experiment was conducted to determine the effects of orchard mulching grass together with using N on microstructure, photosynthetic pigment contents, gas exchange parameters and overall function of photosynthetic apparatus of apple leaves. The experiment were divided into four parts which were mulching grass treatment （C1N0, 1 kg grass per pot）, nitrogen fertilizer （C0N1, 3.4 g N per pot） and mulching grass ＋ nitrogen fertilizer treatment （C1N1, 1 kg grass and 3.4 g N per pot） and control （CK）. [Result] The results showed that C1N0 and C0N1 treatments increased the palisade tissue thickness as well as the ratio of PT/ST, however, compared with the control, there was no obvious difference in spongy tissue and the leaf thickness. Leaf microstructure showed that C1N1 treatment increased the thickness of the palisade tissue, spongy tissue and leaf by 8.45%, 12.91%, and 19.34%, respectively. It also significantly improved the ratio of PT/ST. Straw mulching treatment could change photosynthetic pigment contents, the ratio of chlorophyll and photosynthetic gas exchange parameters, among them, chlorophyll a content, total chlorophyll content, the ratio of chlorophyll a/b and net photosynthetic rate （Pn） increased by 22.7%, 12.71%, 23.42% and 22.83%, respectively. The contents of chlorophyll a, chlorophyll b and total chlorophyll in C1N1 treatmentwere 1.42, 1.04 and 1.37 times than that of control, it also increased the net photosynthetic rate （Pn） and water use efficiency （WUE） by 41.71% and 21.99%, respectively. Photosynthetic pigment content and photosynthetic physiol

关 键 词：苹果 覆草 氮肥 叶片显微构造 光合系统功能 

分 类 号：S661.1[农业科学—果树学]