Biosystematics of the genus Populus L. II. Chemotaxonomy, phenology, fertility, and segregates of native Manitoba species and variants

Abstract

RONALD, W. G., L. M. LENZ, and W. A. C U M~I I N G .1973. Biosystematics of the genus Popllllls L. 11. Chemotaxonomy, phenology, fertility, and segregates of native Manitoba species and variants. Can. J. Bot. 51: 2443-2450. Chemotaxonomical, phenological, fertility, and hybrid segregation characteristics have further el~~cidated the relationships of Poplllrls species and variants in southern Manitoba.S ecies chromatograms, made with bark collections from widely separated localities, were consistently unigrm and proved reliable for species identification. Chromatograms of variant individuals were unlike those of any species examined. Flowering and seed shedding in P. balsai71ifera L., P. delloides Marsh. var. occiderzrnlis Rydb., and variants occurred together and about 2 weeks and 4 weeks later than respective dates for P. rrei7111loicles Michx.Hybrid fertility, measured by seed set was lower than the expected values for fully fertile hybrids of P. bnlsan~ifera and P. rleltoi(1es var. occider~trrlis. All variant pop~~lations, except from Grand Beach, produced greater than 90% vigorous seedlings. Seedling progenies from several apparent F1 hybrids segregated towards P. bnlsanl~era and P. deltoides var. occide~~mlis. No segregates similar to or approaching P. trenillloides were recovered. RONALD, W. G., L. M. LENZ et W. A. CUMMING. 1973. Biosystematics of the genus Poprrllls L. 11. Chemotaxonomy, phenology, fertility, and segregates of native Manitoba species and variants. Can. J. Bot. 51: 2443-2450. Des caracteristiques ayant trait k la chimiotaxonomie, b la pht~~ologie, h la fertilite et B la segregation des caractkres chez les hybrides ont clarifiC les relations entre les espkces et les variantes de Poprrllls dans le sud de Manitoba. Les chromatogrammes, effectuts h partir de collections d'kcorces provenant de localites trks eloignees les unes des autres, Ctaient toujours uniformes pour une espece donnee et se sont donc rCvelCs comme des caractkres scrs pour l'identification des espkces. Les chromatogrammes obtenus de variantes n'etaient semblables B aucun de ceux des espkces itudiies. La floraison et la Liberation des graines chez P. balsnmifera L., P. rleltoides Marsh. var. occidetztalis Rydb. et les variantes se produisent au m&me moment, mals environ deux et quatre semaines plus tard, respectivement, que chez P. tret~ltloides Michz.La fertiliti des Ilybrides, mesurCe par le nombre de graines, avalt une valeur plus basse que les valeurs attendues pour les hybrides complktement fertiles entre P. balsan~ifercl et P. deltoides var. occidetztalis. Toutes les populations de variantes, sauf celles provenant de Grand Beach, ont produit plus de 907, de plantules robustes. Les plantules provenant des graines de plusieurs plantes apparemment hybrides de FI ont montri une segregation en direction de P. babun~ifera et de P. rlelroides var. occidetztnlis. Aucun sigrigat semblable au P. treinllloides ou s'en approchant n'a Cte rencontri.[Traduit par le journal]

Marker allozyme genes and alleles for differentiation of Populus deltoides, P. nigra, P. maximowiczii, and their interspecific hybrids

“…et Gray. Populus deltoides hybridizes with P. balsamifera and P. trichocarpa in nature where their ranges overlap (Brayshaw 1965;Ronald et al 1973aRonald et al , 1973bZsuffa 1975;Eckenwalder 1984b). The isozyme patterns for the loci encoding MDH and 6-PGD in root tips of P. balsamifera (K. A.…”

“…between several species has given rise to a number of interTraditionally, identification of poplars has been primarily specific hybrids (Ronald et al 19730, 19736;Zsuffa 1975; based on morphological and phenological keys (Brayshaw Eckenwalder 1977a, 19776, 1984a, 19846). 1965Eckenwalder 1977a, 19776, 19846;Ronald et al 1973a, Identification of Populus species and hybrids is imperative, 19736; Ronald and Steele 1974) and recently, on chromatoin genetics and breeding studies. P o~u l u s "The buffer systems used are described in Rajora (1989a) and Rajora duction of secondary metabolites are apparently controlled by multiple genes, have complex inheritance patterns, and are mediated by the environment.…”

Natural intersectional hybridization between North American species of Populus (Salicaceae) in sections Aigeiros and Tacamahaca. III. Paleobotany and evolution

“…X pat-ryi ;Smith 1943;Eckenwalder 19770, 1984a), although Ronald (Ronald et al 19730) reported seed set in P . X jackii as only 8-50%.…”

Asymmetrical natural hybridization betweenPopulus deltoidesandP.balsamifera(Salicaceae)This note is one of a selection of papers published in the Special Issue on Poplar Research in Canada.

“…In North America, several species of the genus Populus, particularly species of the sections Tacamahaca Spach. and Aigeiros Duby, are broadly sympatric (Eckenwalder 1984a(Eckenwalder , 1984b, and known to hybridize extensively (Brayshaw 1965;Ronald et al 1973aRonald et al , 1973bEckenwalder 1984aEckenwalder , 1984bRood et al 1986;Greenaway et al 1991;Floate 2004).…”