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Nodal anatomy of two low-chill peach cultivars as related to adventitious root formation
M.M. Qrunfleh, M.M.S. Arafeh and D.M. Al-Eisawi
Advances in Horticultural Science
Vol. 6, No. 3 (1992), pp. 129-133
Published by: Dipartimento Di Scienze Delle Produzioni Vegetali, Del Suolo E Dell'Ambiente Agroforestale – DiPSA – University of Florence
Stable URL: http://www.jstor.org/stable/42881642
Page Count: 5
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Stem cuttings of Flordabelle (FB) and Flordagold (FG) peach cultivars were prepared during mid-June and mid-August to investigate the origin of adventitious roots and the role of sclerenchyma tissue as related to nodal anatomy. The results show that FB and FG peach stems contain three leaf gaps (trilacunar type) immediately below the node area, where the median leaf trace is largest. The origin of the traces is the central core of the vascular tissue. Three orders of emergence for the leaf traces were observed, which are affected by the distance of sectioning made below the node. Moreover, the appearance of the traces leads to the formation of gaps which are either associated with the traces in the area below the node, or they disappear where the traces are freed from the vascular tissue, leading to the formation of a large gap. The results also show that no preformed roots are present; thus adventitious roots in FB and FG are either of nodal or internodal origin. In addition, parenchyma of all leaf gaps, such as parenchymatic tissue outside the trace, parenchyma immediately interior to the bud scales and xylem parenchyma are the origin of adventitious roots. The sclerenchyma ring in the area of leaf and bud gaps of both cultivars is not present.
Advances in Horticultural Science © 1992 Dipartimento Di Scienze Delle Produzioni Vegetali, Del Suolo E Dell'Ambiente Agroforestale – DiPSA – University of Florence