root shoot
1.Studies have been made shown that under water stress, not only root weight, root specific surface area, root-shoot ratio, root growing potential, root water potential, root vessel diameter, etc which express the indexes of wheat root morphology and architecture have significantly changed, but also bleeding sap, root respiratory rate, root plasma membrane permeability, plasmalemma peroxide level, root protective enzymes and its isoenzymes etc which express root physiological indexes have changed correspondingly.
4.Under the treatment of middle irrigation (W2: 1050m3 /hm2) and high phosphorus (P2: 150 kg P2O5 / hm2), crops in wheat-maize-potato system have the tendency to keep leaf chlorophyll content and root dry weight high, to maintain leaf water status well and to adjust the root/shoot ratio to the optimum value, which contributed to high grain yield .
8.The absorption and the root-to-shoot transportation of Na+ and K+ were effectively adjusted by the inclusion of calcium under salt stress.
9.Microelement Mn and nutrition liquid treat with seeds, the result follows that: that liquid enhance the capacity of germination, it is prominent promote the growth of seedling, and enhance the respiration rate of root and shoot and enhance absorbing capacity of root, but it is no prominent effect on content of chlorophylls of seedling.
10.3. The allelopathic effects of decomposition substance of fallen aerial parts from crofton weed were studied in lab, the results showed that the rate of germination, index of germinating speed, length of root and shoot and fresh weight of receptor plants (cucumber, Chinese cabbage, clover and ryegrass) were inhibited significantly when the treatment concentration at 0.01-0.05 gDW/ml.
