One hormone hastens the maturity period in juvenile conifers,a second hormone controls xylem differentiation,while the third increases the tolerance of plants to various stresses. They are respectively:
- AGibberellin,Auxin,Cytokinin
- BAuxin,Gibberellin,Cytokinin
- CGibberellin,Auxin,$ABA$
- DAuxin,Gibberellin,$ABA$
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