By J. G. Hawkes
Read Online or Download Reproductive Biology and Taxonomy of Vascular Plants. The Report of the Conference Held by the Botanical Society of the British Isles at Birmingham University in 1965 PDF
Similar biology books
Biology and Regulation of Blood-Tissue Barriers
This publication used to be written through many striking investigators who've spent a long time to check various elements of blood‑tissue barrier functionality. they've got summarized a number of the most up-to-date and interesting improvement of their fields of analysis together with the blood‑brain barrier, the blood‑retinal barrier, the intestine barrier, the blood‑biliary barrier, the blood‑follicle barrier, the blood‑epididymis barrier, the blood‑testis barrier, the tight junction barrier more often than not in addition to boundaries within the lady reproductive tract.
- Cell Biology: A Comprehensive Treatise. Gene Expression: Translation and the Behavior of Proteins
- Anxiolytic β-Carbolines: From Molecular Biology to the Clinic
- Universality And Diversity In Science: Festschrift In Honor Of Naseem K Rahman's 60th Birthday
- Leviathan or The Whale
Additional info for Reproductive Biology and Taxonomy of Vascular Plants. The Report of the Conference Held by the Botanical Society of the British Isles at Birmingham University in 1965
Sample text
The edaphic conditions do not lend themselves to ploughing and so there is little chance that any artificial reseeding of the pastures has taken place, and it can be regarded as one of the few remaining natural grasslands in the country. Altogether 40 samples of ryegrass were taken from each of 23 sites which varied in management and soil type. Initally the material was vegetatively propagated and studied as spaced plants under standard conditions (Breese and Charles, 1962). Very great differences in a number of characters were found between populations while the variation within populations was surprisingly low, although there was no reason to believe that the 40 independent samples contained the same genotype more than once.
3 summarizes the nature and success of the various crosses attempted. Not all seed from all crosses germinated but a number of artificial hybrids were raised to maturity. Hybrids between Papaver rhoeas and Papaver dubium were readily obtained with either species acting as seed parent. The progeny was highly variable and very odd. The seeds normally lacked dormancy and the young plants were weak, showing apical dieback followed by death or lateral shoot regeneration, chlorotic leaves, malformed leaves and bunchiness.
It is! interesting that the shape of the capsule, which has been regarded as a significant taxonomic character distinguishing these two species is a byproduct of a difference in the breeding mechanism. 36 R E P R O D U C T I V E B I O L O G Y A N D T A X O N O M Y OF V A S C U L A R P L A N T S FIGURE 3 Crossing relationships of the five British species of P a p a v e r . Continuous line arrows indicate successful hybridisation. Dotted arrows indicate seed formed but failed to germinate. ) The easy inbreeding of Papaver lecoqii, P.