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30 days Acacia raddiana acid active buds adult trees annual rhythm annual ring application auxin branches cambial activity cambial zone cambium deciduous defoliated determination of cambial differentiation dormancy Eucalyptus camaldulensis evergreen examined exhibited experiments extension growth Fahn fibres and parenchyma formation gibberellic acid greenhouse growing growth and cambial growth ring growth substances growth-regulating substances high temperatures histological inactive induced investigated Israel kinetin labelled xylem lanolin LDHT LDLT low temperature microtome months observed parenchyma cells period photoperiods Phytol Pistacia lentiscus plants grown polyethylene polyethylene bags production of xylem radiological method rate of cambial ratio xylem-phloem Retama raetam rhythm of cambial Robinia pseudacacia samples scion SD conditions SDHT SDLT conditions season seedlings seems species sprayed stem summer thermoperiods TIBA transfer treatments trunk twigs type of wood various Waisel Wareing wood produced xylem elements Zyggphyllum dumosum Zygophyllum