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Effect of water stre on maize Abstract: Water stre is one of the main restricting factors for maize production.[1] Water stre on various physiological procees of maize have a certain influence, including photosynthesis, respiration, nitrogen metabolism and growth.。In addition, the influence of different moisture content of corn leaf area, stem diameter , root-shoot ratio and other growth indicators.[2] Thus affecting the yield of maize.The result of maize experiment with water stre in different growing stage showed that soil drought stre in many growing stage could lead to yield decreasing.Under water affect of seeding stage is faintish comparatively.[3] Key words: Maize;Water stre;Yield Maize as the 3rd largest food crops in China, occupies an important position in the national economy.Maize production loes caused by natural disasters in other agricultural production in the first place.[4] And the water stre is the most important factor in maize production constraints.Therefore, the study of water on the yield of corn is very important.1、Water stre on physiological procees of maize The relationship between photosynthesis and water potential of maize is very close.Water deficit of maize leaf green protein degradation, destruction of chlorophyll, reducing the absorption of light energy.At the same time, chlorophyll protein is composed of membrane composition, leaf green protein degradation, the structure of the membrane damage, thus affecting the electron transport, inhibition of photosynthetic phosphorylation, so that the driving force for CO2 aimilation and NDPH2 ATP production decreased.Photosynthesis is inhibited, production decline.According to Boyer.JS(1970)Study: When leaf water potential below-0.3Mpa, the rapid increase in respiration of maize;when the leaf water potential below-0.7Mpa, the decrease in water content, respiration rate and decrease.Serious water shortage P O values decreased oxidative phosphorylation coupling resolve, respiration was inhibited.The water stre on nitrogen metabolism is the proce of protein synthesis weakened;growth and development proce of cell division and the squadron have a significant increase of inhibition.[4],2008年
2、Water stre influence maize plant growth index
Dry conditions, corn stem diameter was significantly thicker.2.52.0茎粗（cm）1.51.00.50.0枯水年平水年湿润年丰水年不同降水年型的玉米抽雄茎粗
[2]，44页，2009年
Water stre produce high specific leaf weight, severe water stre is area reduction and even leaves to die.Occur water stre, maize can be hairy leaves reduced by leaf area, in order to enhance water diffusion resistance, and make accepting sunshine of leaf area decline.In addition, occurred in water stre, carbohydrate more aigned to the root, increase the root-shoot ratio, reduce the ground photosynthesis production accumulation.3、Water stre in different growth stages of maize influence
正常供水（CK）常量（g名称 农大108 京科308 吉单261 中单808 丹玉39 郑单958 平均值 222.67 194.83 367.11 363.27
175.07 173.46
287.92 327.21
178.20 167.61
292.85 323.36
104.27 115.71
204.97 261.04 198.67 212.61 366.88 409.54
177.39 191.16
337.00 379.73
187.98 176.72
353.63 350.06
119.25 114.30
275.46 273.79 187.64 342.55
172.54
329.52
132.64
270.61
89.04
228.66 174.82 335.87
168.85
312.52
174.89
345.04
151.56
299.46 172.55 357.68
155.75
316.57
155.22
327.96
115.85
283.93 株）生物产量（g株）
苗期胁迫（MH)常量（g株）
生物产量（g
株）
拔节期胁迫（BH）常量（g株）
生物产量（g
株）
抽雄吐丝期胁迫（TH）常量（g株）
生物产量（g
株）
[3],99页，2009年
Maize yield results show that different childbearing period of water stre which can lead to corn grain yield decreased, no significant difference between varieties, significant difference between treatment.Taeling in silking stage water stre reduction is the most serious, jointing stage next, seedling cut the minimum, with contrast differences significant yield and in silking stage, taeling of photographic comparative differences extremely significant.Water stre also enable maize biological yield decreased, taeling in silking stage the greatest reduction, next is jointing stage, seedling minimum.Experience different growth stages of corn water stre will undoubtedly lead to plant dwarf, growth delay, deterioration of ear characteristics, so that biological and economic yield dropped significantly and so the impact of maize under water stre level, because of drought severity, duration, and birth proce The differences vary, the more severe drought, the longer the duration, is affected by the more even.References
[1] 《春玉米不同品种抗旱性及水分利用效率研究》（程明、周继华、王克武、张娜）（《玉米雨养旱作科技示范工程论文集》（79页，2009年）赵久然 宋慧欣 杨国航编）[2] 《模拟不同降水年型对玉米生长和水分利用的影响》（周继华、王克武、张娜）（《玉米雨养旱作科技示范工程论文集》（41页，2009年）赵久然 宋慧欣 杨国航编）[3] 《Effect of Water Stre on Maize Yield During Different Growing Stages》（BAI Xiang-li1,SUN Shi-xian2,YANG Guo-hang3,LIU Ming1,ZHANG Zhen-ping1,QI Hua1）（《玉米雨养旱作科技示范工程论文集》（97页，2009年）赵久然 宋慧欣 杨国航编）[4] 《Response of DifferentMaize Varieties to Drought Stre》（2008年）(HAN Miaom iao, ZHANG Renhe, ZHU Yongbo, BUL ingduo, XUE Jiquan)[5] 《玉米生育和产量模型》（166页—168页，1997年）（佟屏亚 程延年著）[6] 《Effects of soil water stre on morphological development and yield of maize》（2004年）（BAI Li-Ping, SUI Fang-Gong, SUN Zhao-Hui, GE Ti-Da, LU Yin-Yan, ZHOU Guang-Sheng）[7]《Effect of Water Stre on Maize Kernel Yield and Ear Characterist ics During T aelling Stage》（2002年）（ZHAO Tianhong, SHEN Xiuying, YANG Deguang）
