Effective irrigation can maintain the vigorous photosynthetic metabolism of leaves and lay a physiological foundation for their material production. Dry matter accumulation and leaf response to light and carbon dioxide of maize under irrigation quotas of 50 mm (Q0), 90 mm (Q1), 170 mm (Q2) and 250 mm (Q3) were studied. The results showed that the dry matter accumulation were significantly increased in Q2 and Q3 treatment compared with CK at R3, R4 and R6 stages. With the increase of light intensity, the photosynthesis-light response curves of Q2 and Q3 treatments were increased the most. The apparent quantum efficiency, maximum net photosynthetic rate, light saturation point and dark respiration rate of Q2 and Q3 treatments were significantly higher than those of Q0 and Q1 treatments at V12, R1 and R3 stages. The light compensation point was apparently lower than that of Q0 and Q1 treatments. The maize photosynthesis-CO₂ response curves of Q2 and Q3 treatments demonstrated the largest increase with the increase of CO₂ concentration. The CO₂ saturation point, maximum net photosynthetic rate and carboxylation efficiency of Q2 and Q3 treatments were significantly higher than those of Q0 and Q1 treatments. The CO₂ compensation point was obviously lower than that of Q0 and Q1 treatments. The study provides an effective irrigation and management method for maize in semi-arid area of west Jilin Province, China. When the irrigation quota reached 170 mm, the dry matter accumulation of maize and the response of maize leaves to light and CO₂ were both better. 170 mm could be used as the reference value of maize irrigation quota in western Jilin Province.

中文翻译：

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灌溉限额下玉米干物质积累及叶片对光和CO 2的响应研究

有效灌溉可以维持叶片的旺盛光合代谢，并为叶片的物质生产奠定生理基础。研究了50 mm（Q0），90 mm（Q1），170 mm（Q2）和250 mm（Q3）灌溉限额下玉米干物质的积累以及叶片对光和二氧化碳的响应。结果表明，与R3，R4和R6阶段的CK相比，Q2和Q3处理的干物质积累显着增加。随着光照强度的增加，Q2和Q3处理的光合作用-光响应曲线增幅最大。在V12，R1和R3阶段，Q2和Q3处理的表观量子效率，最大净光合速率，光饱和点和暗呼吸速率显着高于Q0和Q1处理。光补偿点明显低于Q0和Q1处理。玉米光合作用Q2和Q3处理的_2条响应曲线表明，随CO ₂浓度的增加最大。Q2和Q3处理的CO ₂饱和点，最大净光合速率和羧化效率显着高于Q0和Q1处理。CO ₂补偿点明显低于Q0和Q1处理。该研究为吉林省西部半干旱地区的玉米提供了有效的灌溉管理方法。当灌溉定额达到170 mm时，玉米的干物质积累和玉米叶片对光和CO ₂的响应都更好。170 mm可作为吉林省西部玉米灌溉定额的参考值。