［1］Davenport TL，Morgan PAW，Jordan WRY.Reduction of axing transport capacity with age and internal water deficits in cotton petioles [J].Plant Physiology，1980,65:1023-1025.
[2]
Maria A，Pittance A，Baggily L，Guido C.Hormonal responses to partial drying of the root system of Helianthus annuls[J].J Exp Boot，1994，45(270):69-76.
[3]
Saccade K，Corice G，Burlier J，Ryes A.Effect of drought stress on net CO2uptake by zeal leaves [J].Plant，1996,199:589-595.
[4]
Guinn G，Bergamo，E.L，Liqueur，Natal.Leaf age，decline in photosynthesis and changes in insole 3-acetic acid abscises acid and cytokines in cotton leaves[J].Field Crops Research，1993，32:269-271 .
