Involvement of ethylene and 1-aminocyclopropane-1-carboxylate synthase gene in regulation of programmed cell death during rose (Rosa x hybrida) flower development.

Programmed cell death (PCD) is an integral part of plant development. Flower petal usually has the shortest lifetime among all plant organs. There must be a sensitive, tightly controlled PCD in the life cycle of the flower.

Responses of ABA and CTK to soil drought in leafless and leafy apple tree.

The authors tested the contents of ABA (abscisic acid), ZR (zeatin riboside), DHZR (dihydrozeatin riboside) and iPA (isopentenyl adenosine) in leafless and leafy apple trees (Red Fuji/Malus micromalus Makino) during soil drought stress. ABA concentration in drought stressed leafless trees increased significantly compared to the controls. ABA both in roots and xylem rose steadily in the earlier drought stage, reaching a maximum of 1.