摘要
研究了植物生长调节剂优康唑和ＣＰＰＵ对沙田柚生理落果期间幼果和新梢叶片内源ＩＡＡ、ＧＡｔ＋３和ＡＢＡ水平的影响。研究结果表明：优康唑处理降低新梢叶片内源ＩＡＡ和ＧＡ＋３水平，提高细胞分裂素含量。优康唑对叶片ＡＢＡ含量和（ＩＡＡ＋ＧＡｌ＋３十 ＣＴＫＳ）／ＡＢＡ比值影响不明显；优康唑处理下幼果认Ａ、ＧＡ１＋３和ＡＢＡ含量均有不同程度的下降，以ＧＡｒ＋３下降幅度最大。果实中ＣＴＫｓ含量和ＣＴＫＡＢＡ比例上升，结合优康唑和ＣＰＰＵ促进沙田柚座果的效应，提示细胞分裂素对座果有重要作用，而ＣＴＬ／ＡＢＡ比例升高有助于缓解生理落果；ＣＰＰＵ处理降低果实胡Ａ含量，提高果实ＣＴＫｓ水平和ＣＴＫｓ／ＡＢＡ比值。这可能是ＣＰＰＵ促进座果和果实膨大的生理基础。
Effects of Uniconazole arid CPPU on IAA, GA1 + 3 ABA contents in leaves and young fruits of Shatian pomelo during physiological fruit drop period were studied by enzyme linked immunosorbent assay (ELISA). The results showed that: Uniconazole treatment reduced endogenous IAA, GA1 + 3con- tents in new shoot leaves, increased CTKs contents. Effects of uniconazole on ABA content and (IAA + GA1+3 + CTKs) /ABA ratio in leaves were not significant. Uniconazole reduced IAA, GA1 + 3 ABA contents in young fruits, and increased CTKs contents, CTKs/ABA ratio. Corresponding to the promotive effect of fruit-set by uniconazole and CPPU, it suggested that CTKs played an important rule on fruit-set, and the increase of CTKs/ABA ratio could reduce physiological fruits drop. CPPU treat- ment dereased ABA contents, improved CTKs contents and CTKs/ABA ratio in frtuit, it may be the physiological basic of stimulating fruit -set and fruit expanding by CPPU.
出处
《生态科学》
CSCD
2001年第3期44-50,共7页
Ecological Science
基金
国家自然科学基金重大资助项目(39899370)
广东省科技创新百项工程资助项目 (99B05902X)
关键词
优康唑
CPPU
沙田柚
生理落果
内源激素水平
Shatian pomelo
uniconazole
CPPU
physiological fruit drop
endogenous hormone level
