Branching pattern in onion adventitious roots

Branching pattern in onion adventitious roots

1988

SB339.O5REP-0102

The pattern of topographic distribution of lateral roots (LRs) along the adventitous root of Allium cepa L. was studies in relation to the adventitious root vascular system. In the onion LRs arise in vertical files opposite the protoxylem poles, thus forming protoxylem-based ranks of LRs along the mother root.Two protoxylem-based ranks are shown to support large numbers of LRs, whereas the remaining ranks are considerably less prolific. Within each rank short distances between longitudinal neighbor LRs are uncommon. The results suggest that the developing LR influences the location of subsequent LRs forming in the same rank or in nonadjacent ranks was more restricted. Similarly, the existence of nonrandom clumps of LRs could be demonstrated at certain levels of the adventitious root. The ossible effects of interaction between protoxylem-based ranks of LRs as well as likely agents operating from the parent root vascular system are discussed insofar as they represent factors favoring the clumping of LRs. [AS]

v.75(3):425-432, AMERICAN JOURNAL OF BOTANY

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