Sterility in Wild Roses and in Some Species Hybrids.

Taxonomical study of section Caninae )Rosa) and their hybrids in Iran

The genus Rosa has a wide variety in Iran and although some natural hybrids have been found in different regions of the country, but no cultivars have been established so far. In order to optimize use of genetic resources in the country and to create varieties with desirable traits, inter-species relationships and identification of diversity, 45 populations from seven species in sectio...

Budding Compatibility of Almond and Plum on Some Wild Species and Interspecific Hybrids of Almond

ارزیابی سه گونه گلرنگ و نتاج F2حاصل از تلاقی آنها از نظر تحمل به خشکی گیاهچه براساس تجزیه بای پلات

Drought stress is one of the most important environmental factors affecting growth, development and production of crop plants. Drought tolerance in germination and seedling growth stage is very important especially for crop production in dry regions. Sufficient genetic diversity in cultivated species of safflower is limited and seems to be of potential benefit in search of wild species. In this...

Chromosome Behavior in Fertile Triploid Aster Hybrids.

HE sterility of triploids and other unbalanced polyploids is generally conT ceded to be a consequence of irregularities in the distribution of univalents and multivalents at meiosis. Occasional viable gametes are produced, however, because of nonrandom orientation and segregation of chromosome associations. Thus, SATINA and BLAKESLEE (1937a, b) found a higher frequency of n and 2n chromosome nu...

Protoplast Fusion and Brassica Improvement

Brassica coenospecies has been bestowed with a large collection of wild and weedy relatives, which could act as donors of genes controlling agronomically important traits like disease resistance, yield attributes, modified fatty acid composition in the seed etc. Additionally, the cytoplasm of these species could be the sources for developing alloplasmic male sterility systems that are important...