Effects of gibberellin A4/7, root pruning and cytokinins on se
نویسندگان
چکیده
(Picea mariana (Mill.) B.S.P.) trees with gibberellin A4/7 (GA4/7) alone and in combination with root pruning increased both seed and pollen cone production in both 1991 and 1992. Combining GA4/7 and root pruning produced a larger increase in reproductive bud production than either treatment alone, but the complementary effects were less during the warm dry summer in 1991 than during the wet summer in 1992. Cytokinin applications reduced the stimulatory effects of GA4/7 and root pruning, and the degree of reduction varied with the amount and timing of application. Reduced reproductive bud production was attributed to cytokinin countering the effects of root pruning and natural drought on the GA4/7 response.
منابع مشابه
Influences of crown size and maturation on flower production and sex expression in Picea glauca treated with gibberellin A(4/7).
We evaluated the effects of exogenous gibberellin A(4/7) (GA(4/7)) on the production of seed and pollen cones in four stock types of Picea glauca (Moench) Voss. From 1987 to 1991, a combined treatment that included GA(4/7), root pruning and heat stress was applied to 5- to 10-year-old container-grown grafts, representing over 90 clones and originating from 17- to 27-year-old ortets. Hormonal tr...
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