Showing papers by "North Eastern Hill University published in 1977"

Cytogenetics of White Allium

Abstract: During studies over genetic parameters of the local red onion bulbs, certain progenies of maternal half sib families segregated a few white bulbs. Some of these bulbs bred true to the white colour and though they were sexually normal and fertile, a few exhibited seed sterility. These steriles when cultured separately were found to be either translocation heterozygotes or desynaptic strains. In plants a single meiotic ring involving either a few or the entire zygotic chromosome complement is known. But the formation of regular independent rings, each composed of 4 chromosomes, and involving the whole zygotic complement is unknown so far. This has been found in some of these white Allium cepa strains and represents a new type of translocation system existent in the plant kingdom. Predominance of either rings or chains or their equal proportion was observed in the various clones, each configuration being specific and constant for each clone. The predominant occurrence of rings in certain clones could be because the sites of chromosomal breakages are closer to centromere and interchange pieces are more or less equal in length. But where the interstitial segment is short, exchanged pieces are relatively small thus resulting in chain configuration formations.Though pollen fertility ranged from 9-22 per cent, seed sterility was complete in these translocation heterozygotes. When the clones were selfed or intercrossed among each other or crossed as seed or pollen parent with normal fertile Allium cepa, no seeds were set, indicating thereby the existence of male and female sterility in these clones. Genetic control of these regular and specific translocations has been postulated. Since such a type of translocations involving regularly 2 heterozygotes, each of the entire genome, are extremely rare and occur in a very low frequency, their control seems under recessive genes.

‘Twelve-membered dependent origination’ an attempted reappraisal

Abstract: AK: L'Abhidharmakos'a de Vasubandhu, Poussin. AN: The Anguttara Nikaya. BL: Buddhist Logic, Stcherbatsky. Buddhist Philosophy: Buddhist Philosophy in India and Ceylon, Keith. Buddhist Thought: The History of Buddhist Thought, Thomas. CBN: The Conception of Buddhist Nirvana, Stcherbatsky. CCB: Central Conception of Buddhism, Stcherbatsky. Referred to also as Central Conception. DN: The Digha Nikaya. FBDC: La Formule Bouddhique Des Douze Causes, Oltramare. JPTS : Journal of the Pâli Text Society. MKV: Madhyamakavrtti (Mâdhyamikasutras de Nâgârjuna, avec la Prasannapadâ Commentaire de Candrakirti), ed., De La Vallee Poussin. MMK: Mulamadhyamaka-kirikâs, Nâgârjuna. MN: The Maijhima Nikaya. PTS: Pâli Text Society. SN: The Samyutta Nikaya. TDDC: Theorie Des Douze Causes, Poussin. UCR : University of Ceylon Review.

The effect of added salt on competition between two ecotypes ofCynodon dactylon (L). Pers.

Abstract: A population ofCynodon dactylon (L.) Pers. from alkaline soil and one from normal soil were grown in replacement series on soil with various salts. The population from the alkaline soil was more competitive than the population from normal soil when grown on soil treated with salts. The reverse situation existed on normal soil. In a mosaic environment competition between the two ecotypes can occur in the field and could be important in their adaptation.