Some aspects of the ecophysiology of flowering intensity of mango (Mangifera Indica L.) cv. Nam Dok Mai in a semi-tropical monsoon Asian climate

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• 作者：Pongsomboon ; W. ; Subhadrabandhu ; S. ; Stephenson ; R.A.
• 关键词：Water stress ; Temperature ; Carbohydrates ; Endogenous growth substances ; Flowering ; Mangifera indica
• 刊名：Scientia Horticulturae
• 出版年：1997
• 出版时间：June, 1997
• 年：1997
• 卷：70
• 期：1
• 页码：45-56
• 全文大小：615 K

文摘

During the dormant period in 1988-1989, four-year-old mango trees cv. Nam Dok Mai, grown in the orchard of the Department of Horticulture at Kasetsart University (Kamphaengsaen Campus), Nakhon Pathom Province, Thailand, were studied. The changes and relationships between leaf xylem water potential (ψ_x), relative water content (RWC), total nonstructural carbohydrates (TNC) in terminal shoots, and GA₃- and ABA-like substances in shoot tips during November and December, and flowering were studied. Changes in ψ_x and RWC were from −0.31 MPa and 97 % at the beginning of the dry period (mid November) to −0.82 Mpa and 93 % , respectively in mid December. There was a positive correlation between ψ_x and RWC. Low TNC levels were ca 70-98 mg glocose equivalent/g dry wt.) at the beginning of the dormant period and thereafter increased to 110-120 mg glucose equivalent/g dry wt. and finally declined to ca 70 mg glucose equivalent/g dry wt. prior to flowering. TNC were poorly correlated negatively with RWC, but not correlated with ψ_x. GA₃-like substances were high (1.5-1.7 μg equivalent/g fresh wt.) at the beginning of the dormant period, but declined by about 50 % in late November prior to increasing slightly through to inflorescence emergence. The change in ABA-like substances was comparatively small during the dormant period. GA₃-like substances were negatively correlated with RWC and ψ_x whereas ABA-like substances were not. Flowering intensity was negatively correlated with average RWC and average ψ_x (r = −0.65^* and −0.72^*, respectively) but was positively correlated with TNC (r = 0.75^{* *}). Flowering intensity was negatively correlated with GA₃-like substances (r = −0.79^{* *}), but not correlated with ABA-like substances.