低磷胁迫下光质对番茄幼苗生长及生理抗性的影响

为研究低磷胁迫下不同光质对番茄幼苗生长及生理抗性的影响,以番茄品种‘中杂9号’为试材,采用水培法,设置2种不同光质（蓝紫光、白光）与3个磷素水平（0.22、0.44、0.66 mmol/L）共6个组合处理。结果表明,与正常供磷水平相比,轻度、重度低磷胁迫下番茄叶绿素含量、叶片相对含水量、生物量均显著降低,总根长、丙二醛含量、超氧化物歧化酶、过氧化物酶、过氧化氢酶活性和可溶性糖、可溶性蛋白、脯氨酸含量均显著增加。同时,低磷胁迫下,相较于白光处理,蓝紫光处理明显增加了番茄幼苗叶绿素含量、叶片相对含水量、总根长、总表面积、平均直径;同时降低了叶片和根系中的MDA含量,提高了可溶性糖、可溶性蛋白、脯氨酸含量和抗氧化酶活性,进而促进了植株生物量的积累。综上,蓝紫光处理能够增强番茄植株对低磷胁迫的适应能力。

Effects of Light Quality on the Growth and Physiological Resistance of Tomato Seedlings Under Low-Phosphate Stress

To explore the effects of different light quality on the growth and physiological characteristics of tomato seedlings under low phosphorus stress, we used ‘Zhongza 9’ tomato cultivar as the experimental material and set up six combination treatments with two light quality (white and blue-violet light) and three P levels (0.66, 0.44 and 0.22 mmol/L NaH₂PO₄) under hydroponic cultivation. The results showed that, compared with the control treatment, the leaf chlorophyll contents, leaf relative water content and biomass were significantly reduced under low phosphorus condition, while the total root length, the MDA level, SOD, peroxisome, CAT activity, and the content of soluble sugar, soluble protein and proline increased significantly. At the same time, compared with white light treatment, blue violet treatment could obviously increase the chlorophyll content, leaf relative water content, total root length, total surface area, average diameter of tomato seedlings, thus to improve the accumulation of biomass. In summary, blue-violet treatment can enhance the adaptability of tomato plants to low phosphorus stress.