Abstract: Biological response of the sane grape cultivar grafted by different rootstocs to the different irrigation metods were studied, which provided biological basement for spreading and using resistant rootstocks and saving-water irrigation. Biological effects of 1/2 divided root irrigation on M/420A、M/3309C and M/110Rwere studied by simulating soil boxes with controlled alternate irrigation for half part of rootzone, controlled fixed irrigation for half part of rootzone,and conventional irrigation for whole root zone, and the grafted graoe had been anatomized after the leaf falled. The results showed controlled alternate irrigation remarkably promoted the growth of current-grew roots , new roots numbers, the surface area and volume of effective roots and roots length of the three kinds cultivar/rootstock, however restricted the growth of new shoots compared with conventional irrigation. Then root-shoot ratio of M/3309C、M/420A and M/110R increased 41.18%、23.68% and37.5%. Under controlled fixed irrigation, the growth and length of new roots in dry zone remarkably decreased, M/3309C which drought-resistent was lower reduced especially most compared with CK, and reduced 67.67%,then induced total mass of new roots and growth of new shoots decreased sharply. The prolonged growth of shoot internodes were restricted under controlled alternate irrigation and controlled fixed irrigation, M/110R reduced a little which the base shoot internodes reduced 7.37% and 23.74% respectively and the top shoot internodes reduced 9.72% and 19.75% respectively. The research indicated different cultivar/rootstocks had obvious distinction to adapt to water stress, alternation irrigation contributed to increase roots growth of grape, improve the ability of drought-resistent.

Key words: Grape, Rootstock, Irrigation type, Biological responce,