淹水对甜樱桃根系呼吸强度和呼吸酶活性的影响

以美早/东北山樱桃(Prunus serrulataG.Don)和美早/马哈利(P. mahaleb L.)为试材，研究了淹水对甜樱桃根系（生长根和褐色木质根）呼吸强度和呼吸酶活性的影响.结果表明：淹水过程中，两种甜樱桃砧木生长根和褐色木质根呼吸强度均呈下降趋势，生长根降幅更大；东北山樱桃生长根和褐色木质根呼吸强度降幅分别是马哈利的1.47和1.36倍.丙酮酸脱羧酶(PDC)、乳酸脱氢酶(LDH)活性在两类根系中均呈先升后降趋势，乙醇脱氢酶(ADH)活性在生长根中亦先升后降，而在褐色木质根中为上升趋势，3种酶活性变化幅度表现为生长根大于褐色木质根；东北山樱桃ADH和LDH活性增幅大于马哈利，但PDC活性则相反.两类根系苹果酸脱氢酶(MDH)活性均下降,且生长根降幅大于褐色木质根；东北山樱桃MDH活性降幅大于马哈利.说明生长根对淹水的敏感性强于褐色木质根；与马哈利相比，东北山樱桃对淹水更敏感.

Effects of waterlogging on root respiration intensity and respiratory enzyme activities of sweet cherry.

Taking Meizao/Dongbeishanyingtao (Prunus serrulata G. Don) and Meizao/Mahaleb (P. mahaleb L.) as test materials, the respiration intensity and respiratory enzyme activities of their growing roots and brown lignified roots were determined under waterlogging. The results showed that under waterlogging, the root respiration intensity of the two kind rootstocks had a decreasing trend, with more decrement for their growing roots. For P. serrulata, the decrement of the respiration intensity of its growing roots and brown lignified roots was 1.47 and 1.36 times as much as that of P. mahaleb, respectively. The pyruvate decarboxylase (PDC) and lactate dehydrogenase (LDH) activities of the two kind roots had a decrease after an initial increase. Alcohol dehydrogenase (ADH) activity in growing roots also had a decrease after an initial increase, but that in brown lignified roots had an increasing trend. The test three enzyme activities changed more in growing roots than in brown lignified roots. The increment of ADH and LDH activities was higher for P. serrulata than for P. mahaleb, while PDC activity was in adverse. The malate dehydrogenase (MDH) activity of the two kind roots decreased, and the decrement was larger in growing roots than in brown lignified roots. P. serrulata had a larger decrement of root MDH activity than P. mahaleb To the waterlogging stress, growing roots was more sensitive than brown lignified roots, and P. serrulata was more sensitive than P. mahaleb.