两种冬青花芽分化期内含物质变化特征OA

Taking deciduous Ilex decidua'Hongmanao'and the evergreen I.'Nellie R.Stevens'as experimental materials using the methods of dynamic determination of physiological and biochemical indicators and statistical analysis,the effects of dynamic changes in organic nutrients,mineral elements and endogenous hormones on flowering during different stages of flower bud differentiation(physiological differentiation stage,floral primordium differentiation stage and floral organ formation stage)were investigated,in order to provide references for clarifying the flowering physiological mechanism and flowering period regulation of deciduous and evergreen hollies.The results showed that'Nellie R.Stevens'possessed high soluble sugar reserves during the physiological differentiation stage,while'Hongmanao'exhibited absorption peaks for total N,P,and K during the floral primordium differentiation stage.The flower-promoting hormone ratios ZR/GA3 and ABA/GA3 in'Nellie R.Stevens'were significantly higher than those in'Hongmanao'.Conversely,'Hongmanao'maintained a significantly higher and stable ABA/IAA ratio(7.13).Correlation analysis indicated that the flowering quantity of'Nellie R.Stevens'was highly significantly positively correlated with the carbon-nitrogen ratio(C/N,r=0.72),whereas'Hongmanao'showed no significant response to C/N(r=0.15)and was mainly regulated by endogenous hormones.PCA confirmed that genetic characteristics between cultivars were the primary factor causing physiological metabolic differences,with a contribution rate of 62.3%.In conclusion,nutrient supply should be strengthened and GA3 content reduced for deciduous cultivars such as'Hongmanao';for evergreen cultivars such as'Nellie R.Stevens',nitrogen should be precisely controlled to promote flowering by increasing the C/N ratio.