Premature senescence in greenhouse tomato is a significant challenge under long-season cultivation, due to suboptimal nutrient management during growth periods. We investigated the effects of microbial agents (T1), corn protein ferment (T2), and their combined application (T3) on photosynthetic characteristics and antioxidant enzyme activities in 'Saint Laurent 3689' tomato leaves, normal management served as the control (CK). We explored the physiological mechanism of delaying leaf senescence. Results showed that applying microbial agents or corn protein ferment individually led to improvements in leaf photosynthetic characteristics and antioxidant enzyme activities. The combined application yielded superior outcomes. Eighty days post the combined application of microbial agents and corn protein ferment (T3), chlorophyll (a+b) content, net photosynthetic rate, and the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in leaves increased by 16.4%, 30.9%, 23.4%, 33.0% and 40.3%, respectively, compared with the CK. Furthermore, plant height and stem diameter increased by 8.2% and 7.0%, while the total yield exhibited a significant increase of 9.9% compared with the CK 210 days post-treatment. In conclusion, the combined application of microbial agents and corn protein ferment has promising potential in enhancing chlorophyll content, net photosynthetic rate, and the activities of SOD, POD and CAT in tomato leaves. This approach effectively delayed leaf senescence, thereby promoting tomato growth and remarkably increasing the yield.
为解决设施长季节栽培番茄因养分管理不当引发的植株早衰问题,本研究以‘圣罗兰3689’番茄为试材,以正常管理为对照(CK),研究微生物菌剂(T1)、玉米蛋白酵素(T2)及两者配施(T3)对长季节栽培番茄叶片光合特性和抗氧化酶活性等生理特性的影响,探究其延缓叶片衰老的生理机制。结果表明: 单独施用微生物菌剂或玉米蛋白酵素均能提高番茄叶片光合特性和抗氧化酶活性,但两者配施效果更好。微生物菌剂和玉米蛋白酵素配施(T3)处理后80 d,番茄叶片中叶绿素(a+b)含量、净光合速率、超氧化物歧化酶、过氧化物酶和过氧化氢酶活性分别较CK增加16.4%、30.9%、23.4%、33.0%和40.3%。处理后210 d,株高和茎粗分别较CK增加8.2%和7.0%,产量显著增加9.9%。综上所述,微生物菌剂和玉米蛋白酵素配施可通过提高番茄叶片中叶绿素含量、净光合速率和抗氧化酶活性来延缓叶片衰老,促进番茄生长,提高产量。.
Keywords: antioxidant enzyme activity; corn protein ferment; long-term cultivation; microbial agent; photosynthetic characteristics; tomato; yield..