Effects Of Drought Stress On The Growth Of Arachis Pintoi Cv.Amari Llo And Its Physiology And Biochemical Indexes

Arachis pinto（iArachis pintoi cv.Amari llo）is largely grown in southern China asa kind of grass lawn with ornamental value, while seasonal drought seriouslyimpacts the ecology landscape of Arachis pintoi. Therefore the study on thedrought-resistant mechanism possesses important theoretical and practicalsignificance for plantation management of Arachis pintoi under the droughtcondition. This paper studies the relationship between the change rule of physiologyand biochemistry and drought resistance through investgation on the Arachis pintoiplant change of ecology landscape and physiology and biochemistry under thestress of continue soil drought in order to provide theoretical basis of syntheticalidentification for drought resistance and its cultivation under drought condition. Themain results showed fellow.The growth of the aerial part of Arachis pintoi was inhibited under drought stress,but appropriate drought stress treatment was beneficial to the growth of A.pintoi, itplayed a part of seedling adaption.Under drought stress, the leaf relative water content(RWC) was decreased becauseof the decreased of soil RWC which quickly decreased at0-6d and decreased slowlyafter6d. The leaf relative water content also showed the decreasing trend, comparingto CK it significantly decreased61.38％and64.69％after24d stresss treatment.The chlorophyll Content showed character of earlier increasing and later decreasingunder drought stress, it maximizing was3.36when soil RWC was15.33％after15d drought stress.The leaf protoplasmic membrane penetration(RPP) of A.pintoi increasedgradually during the prophase of drought stress. From the15d of drought stress, theRPP began to increase, and with the increasing degree of drought stress, the RPPreached maximum86.09%when it was in the24d of drought stress.The activities of superoxide dismutase(SOD) of turf grass increased earlier andthen decreased by drought stress, it increased slowly in6d and increased quicklyin the6d to9d, the deffrence was significant, it began to decrease after9d and decreased fastestly in9d to18d and arrived minimum value0at27d. The activities ofA.pintoi peroxidase(POD) earlier decreased and then increased by drought stress, itslightly decreased in9d after stress and then rapidly increased within9d to12d, it washigher30.3％than CK at12d after stress. After that, it would increase gradually by theincreasing degree of drought stress. The content of malonaldehyde(MDA) of A.pintoiincreased gradually during the prophase of drought stress. With the increasing degreeof drought stress, it reached the maximum12.16umol.g-1at the18d, then decreasedrapidly, and it reached0at the27d.The content of free proline (PRO) of A.pintoi changed little by drought stress in thefirst9d. After12d of drought stress, the content of leaf free PRO increased rapidly,after15d of drought stress, it was extremely significant differences with CK. Itreached maximum at24d and then decreased slightly. The content of soluble sugar ofA.pintoi increased firstly and then decreased with the increasing degree of droughtstress. And it was higher than CK in different degree. The content of soluble sugarreached the maximum43264.37at24d, it equals2.76times of CK and was significantthan CK.The content of soluble protein of A.pintoi increased firstly and thendecreased with the increasing degree of drought stress. And it was higher than CK indifferent degree. The results showed that there is no obvious difference between them.