Eleven edible wild greens of West Bengal (Enhydra fluctuans, Hydrocotyle asiatica, Herpestis monneira, Oxalis corniculata, Mollugo spergula, Mollugo hirta, Cephalandra indica, Hygrophila spinosa, Amaranthus spinosus, Rumex vesicarius and Trianthema monogyna) were analysed for moisture, protein, fat, carbohydrate, ash, crude fibre, calcium, phosphorus, iron, nicotinic acid, ascorbic acid and calories. The nutritive value of the leaves of these species was generally low.
VII. SummaryOf the genetic problems upon the solution of which immediate progress in plant breeding depends, hybrid vigour is in the front rank. This is particularly the case in naturally out-pollinating and highly self-sterile plants such as many forms of Brassica oleracea, and some of the pasture plants. But in these, genetic experiment is peculiarly difficult. With some crops, notably maize and the tomato, it has proved practicable and clearly advantageous to grow commercial crops of F1 plants. Even in the British cereals (all, save rye, highly self-fertile and self-pollinating) there are grounds for believing hybrid vigour to be of some economic interest. A thorough investigation of vigour was therefore made in the cross Little Joss × Thule (both T. vulgare) in the F1, F2 and F3 generations. In addition a range of ninety-four crosses was studied on a small scale. Of these fifty-six were between varieties of T. vulgare, the remainder being interspecies, some with parents of the same chromosome number and some not. “Vigour”, variably specified by investigators, was here taken to be yield of grain together with the associated attribute, tillering. Certain physiological experiments were also made on grain weight, germination rate, embryo weight and respiration rate of the germinating grain. The crosses were made reciprocally.
Synopsis
Triticum vavilovi, a lesser known hexaploid wheat, was successfully crossed reciprocally with T. sphaero‐coccum and with 3 strains of T. vulgare to aid in determining its taxonomic status and genetic relationships. The F1 plants were comparatively normal in appearance and fertility. Most F2 plants had highly fertile pollen though sterility was observed in some. A few F2 plants of the sphaerococcum cross were highly to completely seed sterile. In general the data suggest that T. vavilovi is more closely related to T. vulgare than its superficial appearance might indicate.
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