|
Photinia (Photinia Lindl.) The heather ( P. serrulata ) , the spinulosa wood heather (P. davidsoniae), ' Red Robin ' (P. × fraseri'Red Robin ') and' Rubens ' (P. glabra, of var . Robens ) 2 -year-old cutting seedlings as test material , growth traits and physiological characteristics in five different soil water level comparative analysis of the turn waterlogging, drought resistance of seedlings comprehensive evaluation designed for future breeding ornamental value and provide a theoretical basis for resistance to water stress ability heather species . The main findings are as follows : 1 . Fully flooded treatment , flooded stems coarse growth accelerated , the lenticels swelling and late duress gradually formed adventitious roots , the remaining level of seedlings (control except ) appear in the lower leaves wilting , yellowing and shedding , withered , and other phenomena ; addition, the varying degrees of the biomass of the seedlings was inhibited . Under waterlogging stress , total chlorophyll content of the seedlings basic trend first increased and then decreased under drought stress as a whole showed an upward trend and the content is substantially lower than that of the control level ; under water stress , the carotenoid content of seedlings During the test, the basic lower than the control level . Under water stress , the plasma membrane of seedlings relative permeability showed an upward trend; drought stress under the MDA content overall upward trend , the trend of the first increased and then decreased under waterlogging stress ; soluble protein, soluble sugar , candied the basic acid content first increased and then decreased trend osmoregulation three different seedlings . 4 by membership function analysis , draw the sort of comprehensive evaluation of four kinds of Photinia seedling resistance to water stress : waterlogging : 'Red Robin ' gt ; heather gt ; the spinulosa wood heather gt ; ' Rubens ' drought resistance : ' Rubens ' gt ; heather gt ; ' red Robin ' gt ; spinulosa wood heather
|