The correlations between them and NUE are either significant or extremely significant except root active uptake area, which has significant correlation to NPE.
So root dry weight, root volume, root active uptake area, root activity and GS activity can be considered as indices for selecting and breeding high N use efficiency tea clone.
Application of P nutrition could increase and raise root volume, root dry weight, root length, root activity and root active absorb area under water stress.
N accumulation was closely correlated to number of adventitious roots per plant,root dry weight per plant,total length of adventitious roots per plant,total root absorption area per plant,root active absorption area per plant and total α-NA oxidizing amount of roots per plant,other than the traits for single adventitious root or root activity per unit dry weight.
The results showed that either nutrition pot or tray heeling-in was able to retard the elongation of taproot,promote the development of side roots,enlarge stem circumference and the volume of root system,significantly increased the chlorophyll content,root vigor and root active(absorbing) area.
Except that the change of active area of roots is not distinct, main root length, root volume and fresh/dry weight are all decreased obviously compared with CK, whose range of change is 14.1%～35.6% (T1) and 203%～426% (T2).
thelength of root per unit and per plant were great The root activity per dry-weightand per plant were high and the activity absorb area of root per plant was big.
The purpose of the study is to simulate profiles of soil water content and temperature at root active zone (i.e., 0-50?cm), taking the root water uptake, soil evaporation, and canopy transpiration into account.
Among the vegetative tissue active promoters, the ratio of leaf active versus root active is about 1.6.
Covering the ground with plastic film of Brassica pekinensis Rupr. accelerated the growth of root systems, increased root activity of chinese cabbage. At 92 days after seed sowing, The number of roots increased 22.6—24.2%; The diameter of roots increased 5.4—5.7%; root weight increased 15.85—18.89%; amount of bleeding increased 13.46—38.95%; and the active absorption surface of root system increased 47.7—67.5%. as Compared with control. Ground cover with film also promoted the growth of aerial parts, increased...
Covering the ground with plastic film of Brassica pekinensis Rupr. accelerated the growth of root systems, increased root activity of chinese cabbage. At 92 days after seed sowing, The number of roots increased 22.6—24.2%; The diameter of roots increased 5.4—5.7%; root weight increased 15.85—18.89%; amount of bleeding increased 13.46—38.95%; and the active absorption surface of root system increased 47.7—67.5%. as Compared with control. Ground cover with film also promoted the growth of aerial parts, increased the leef surface and photosynthetic intensity. At 45 days after seed sowing, in comparison with control, weight of whole plant increased 100%; leaf surface increased 25.99—59.35%, as compared with control. During 42—72 days after seed sowing, the net photosynthetic rate increased 9.5—44.9%. It is considered that the above advantageous influences of film cover caused the yield increased 21.72—25.82%(average increment of yield per hectare is 18.75 tons). the quality of the cabbage was also higher.
This paper deals with the morphological and anatomical structure of soybean varieties which have different drought resistance in the field condition.The main results were as follows:As compared with drought sensitive varieties,the drought resistance varieties of soybean were characterized as that,their seeds germinated fast and the seedlings sent out more seconday-roots; their roots grew more quickly and the root system well developed which main root penetrated deeply in soil.As much more root quantity distributed...
This paper deals with the morphological and anatomical structure of soybean varieties which have different drought resistance in the field condition.The main results were as follows:As compared with drought sensitive varieties,the drought resistance varieties of soybean were characterized as that,their seeds germinated fast and the seedlings sent out more seconday-roots; their roots grew more quickly and the root system well developed which main root penetrated deeply in soil.As much more root quantity distributed in deep soil,the root systems were belonged to "deep root type",The root system had.higher dry matter content and larger active absorbing surfance.The conducting tissues of foot system ware well developed because more vessels in it.
The results of experiments in 1987～1989 showed that moderate water stress inhibited growth and development of maize varieties at different stages. But variety Yuyu 3 posessed stronger ability to resist drought. Its leaf area, dry matter, the ratio of shoot to root and active absorption area of root decreased less under drought condition. Drought at seedling stage enhanced root growth of varieties, and increased adaptation ability. The ability to resist drought dropped down after shoot elongation, especially...
The results of experiments in 1987～1989 showed that moderate water stress inhibited growth and development of maize varieties at different stages. But variety Yuyu 3 posessed stronger ability to resist drought. Its leaf area, dry matter, the ratio of shoot to root and active absorption area of root decreased less under drought condition. Drought at seedling stage enhanced root growth of varieties, and increased adaptation ability. The ability to resist drought dropped down after shoot elongation, especially during the stage of sexual organ formation when drought caused serious injry and significant decrease of yield. Drought resistance of a variety was mainly expressed by the ability to resist drought from shoot elengating to flowering.
根系活跃
root active
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