梨树叶片结构与抗斑点炭疽病的关系

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Abstract：To explore the relationship between the resistance of pear tres to black spot anthracnoseand leaf structure，ninepearcultivarswereusedasmaterialsinthisstudy.Throughfieldresistanceidentificationfortwoconsecutive yearsfrom2O21 to 2O22，theresistance levelsofdiferent pear cultivars toblack spotanthracnose weredetermined.The stomatal density，waxcontent，leaf weightratioandleafcelltissuestructurecharacteristicsofeachcutivarwereobserved anddeterminedinthelaboratory，andtherelationship between leaf structureandresistancetopear black spotanthracnose wasanalyzedbycorrelation.Theresultsshowed thatdiffrentpearcultivars haddifferentresistancetopearblack spotan

thracnose.Cuiguan，Xinyu and Changtingchengtuoli were highly susceptible cultivars，Xincui and Cuiyu were susceptiblecultivars，and Zheli6，Yunxiaoniaoli，Lianchengbayuebai and Wupingjingmiliwere highly resistant cultivars.There were differences in stomatal density，wax content and leaf weight ratio，as well as leaf thickness， upper/lower epidermis thickness，spongy tissue thickness and tissue compactness among different pear cultivars，but therewasnosignificantcorrelationwithdiseaseindex.The palisade tissue thickness and tissue porosity in leaf tissue

structure weresignificantlynegativelycorrelatedandsigificantlypositivelycorelated withdiseaseindex.Diferentpearcultivarshaddiferentresistancetoblack spotanthracnose，andthepalisadetissue thicknessandtissueporosityof pearleaves could be used as the main reference indexes for resistance identification of pear black spot anthracnose.

Key words：pear；black spot anthracnose； leaf structure；palisade tissue thickness；tissue porosity；resistance

近年来，由于气候异常、病虫为害、管理失当等原因，南方梨产区梨发生早期落叶、返青、返花现象，直接影响次年产量和品质[1-3]。（剩余8386字）