Drought resistance and photosynthesis of two species of ceratoides under the condition of artificial soil desiccation were studied based on some indexes of water and photosynthesis 摘要用盆栽控水的方法模拟土壤干旱条件，从水分生理和光合作用方面对两种驼绒藜属植物的抗旱生理进行研究。
Therefore it can be conduded that mcsuchun can maintain ( or recover ) normal metabolism and osmotic adjustment ability of apple seedlings under drought condition , and increase drought resistance of the plant 这说明，干旱条件下摩素淳能提高苹果树苗的渗透调节能力，恢复或维持正常代谢水平，提高植物的抗旱性。
The experimental results showed that chlorophyll content and photosynthetic rate of irrigated sugarbeet seedlings were increased under the drouthy springtime , especially high photosynthesis of leaf was kept during growth anaphase 摘要春季干旱条件下，苗期灌溉处理可以提高甜菜叶片叶绿素含量和光合速率，尤其对于生育后期保持叶片较高的光合能力有明显作用。
C . smyrnioides would allocate more biomass to root for store with growing . the ratio of biomass stored in root of two year old plant was more than one year old , and drought than saturation , the last period of growth than start period 明党参植株分配较多的生物量到根进行储备，干旱条件下较湿润条件下更大，二年龄较一年龄分配的比例更大，生长末期较初期更多。
The time and the devotion of procreate of three species are both influenced by soil water . it is possible for three year old flourish plant of c . smyrnioide to flowering . it is later more for the plants stressed by drought 3种土壤水分条件下，明党参和川明参植株一年龄至二年龄的存活率均为85 . 7 ，而峨参较低，饱和条件下最高为71 . 4 ，干旱条件下最低，仅14 . 3 。
Those and other wealthy nations are investing in windmill - powered plants that turn seawater to drinking water , in flood barriers and floatable homes , and in grains and soybeans genetically altered to flourish even in a drought 这些国家与其他富国正投资建设由风力发电设备驱动的将海水淡化为饮用水的工厂，同时还在投资建设防洪堤、水上漂浮住宅、以及能在干旱条件下生长的转基因谷物与大豆。
It was the most important task to investigate the relations between meteorological factors and incidence of common infectious diseases . because it could provide scientific evidence for the prevention of epidemic situation in drought area . subjects and methods 1 因此研究干旱地区气象因素对传染病疫情的影响，科学地预测其发生、发展规律，对于预防和控制干旱条件下的传染病流行具有重要的意义。
Under middle level drought condition mosuchun can increase content of soluble organic osmoticum ( pro , amino add and sugars ) maintain or raise the activity of sod and cat , and decrease permeability of plasma and content of mda 在干旱条件下摩素淳能增加游离氨基酸、可溶性糖和脯氨酸3种有机渗透调节物质的含量，维持或提高sod和cat活性，降低膜相对透性和mda含量，防止或降低了膜脂过氧化作用对膜的伤害。
Many researches show , the environmental adaptable process of the xerophytecan be divided into two different stages . in the first stage , seeds sprout and fini - sh the adaptation xerophytic process ; in the second stage , xerophyte grows in arid condition by using natural water 前人大量研究工作表明，旱生植物对环境的需求，可划分为两个不同阶段，前一阶段始于种子萌发并逐渐形成适旱结构，后一阶段是植物在干旱条件下利用当地自然水源而生长。
Although different researchers have different results , even some are contradictory , on the whole , all kinds of changes are adaptive reaction to water stress , which have advantage to improving wheat resistance of drought and have importance effect to yield formation under drought 虽然不同的研究者所获得的研究结果不同，有的甚至相互矛盾，但从总体上看，各种变化是对干旱胁迫的一种适应性反应，有利于提高小麦的抗早能力，对干旱条件下产量的形成具有重要作用。
