Eleven crambe introductions grown in 14‐ and 38‐inch rows in southern and northcentral Indiana in 1964 were evaluated for number of branches and seed pods in different regions of the plant, plant height, weight of seed pods and seeds per volume of seed pods, and yield. A highly significant difference between the two locations was found for most characters. Different row spacings significantly affected most of the characters measured. However, variation among introductions was significant only for the number of branches attached to the lowest 4 inches of the main stem and the number of primary branches on the whole plant. Plant‐to‐plant variation within introductions in wide rows was heterogeneous for number of primary branches and seed pods in the lower regions of the plant. Desirable plant habit for combine harvest is possible with the material available by using appropriate cultural practices and selecting among and/or within introductions. For yield, however, to insure an effective improvement program in crambe, additional introductions of new diverse material or the possible development of more variable populations by hybridization seems necessary.
Results obtained after use of a cytoplasmic male‐sterile restorer gene system in testcrosses with translocations for chromosome analysis were compared with those from testcrosses after hand emasculation. The use of male‐sterile cytoplasm was relatively easy and less time consuming, thus allowing production of large numbers of progeny and an accurate estimate of linkage intensity.This variation in methodology may have application with other self‐pollinated crops where cytoplasmic male‐sterile restorer gene systems and transloeation stocks exist.Using this scheme the linkage groups T231(13.06±l.1)‐ Dd and T396(5.0±0.6)‐Yy were found, and the possible location of these markers was discussed. The establishment of the chromosome complement and male sterility of MSCK60 as a standard for chromosome analyses in sorghum was proposed.
A rapid microsedimentation test is proposed that enables wheat breeders to evaluate very small wheat (Triticum aestivum L.) flour samples of 0.16 g simply, rapidly, and accurately. In eight hours 400 duplicate or 800 individual F2 plant samples were tested by a team of four while a further increase to 600 duplicate samples may be possible. Pickney's modification of the original test procedure was reduced to micro scale. Changes were also made in milling procedure and reagent ratio. Twentyfour samples were analyzed simultaneously. A high positive correlation exists between result of this test and those of Pickney's modification.
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