Physiological response to drought stresses and drought resistances evaluation of different Kentucky bluegrass varieties

doi:10.11686/cyxb20140427

Abstract

Abstract: To compare the drought resistance of bluegrass seedlings,the 14 varieties of Kentucky bluegrass seed were sowing after disinfection in the plastic pots,then thinned after emergence and fixed strains at 2 to 3 true leaf,left 15 uniform growth and distribution plants in every pot and regularly watering to ensure the normal growth of the seedlings. Drought stress trails were identified at 2 to 3 true leaf period by adding the PEG-6000 according to the Michel formula which are: 0 MPa (control),-0.3,-0.6,-0.9,-1.2 MPa in the study. Then supplement water every two days to maintain the concentration. Two groups of drought treatment and control (normal watering) were set to simulate drought stress of 14 bluegrass cultivars and four replications were set by treatment. The physiological and biochemical index,such as chlorophyll (CHL),malondialdehyde (MDA) content,proline (Pro) content,peroxidase (POD) and superoxide dismutase (SOD) activity were measured and analyzed. The content of CHL was decreased; and the content of the Pro,MDA and SOD showed upward trend; the POD activity increased at first and then decreased and finally increase again in the bluegrass seedlings; Drought resistance of 14 bluegrass varieties were obtained by subordinate function the order is: The No.3 Storpy>No.10 Narrow leaf bluegrass>No.1 Meri>No.2 Geronimoi=No.9 Blue apphire>No.7 Kentucky bluegrass>No.11 Kentucky bluegrass>No.4 Kentucky bluegrass>No.5 Wabash>No.8 Bluegrass=No.13 Kentucky>No.14 Kentucky bluegrass>No.6 Monopoly=No.12 Fylking.

CLC Number:

S543⁺.903.4

GUO Yu-pin,MI Fu-gui,YAN Li-jun,REN Yong-xia,LV Shi-jie,FU Bing-zhe. Physiological response to drought stresses and drought resistances evaluation of different Kentucky bluegrass varieties[J]. Acta Prataculturae Sinica, 2014, 23(4): 220-228.

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