The cotton plant in Egypt, studies in physiology and genetics . ny possible modality in the diagram we found the valuefor correlation between these two characters in Fg to ber= 0-331 (± 0-061). The explanation is presumablymechanical; the bolls with more loculi have more septa, Charara King : M \ :?? / \ r j \, \J ^ v 50 0-60 0-70 Wjdtji Length Fig. 62.—Form of the Boll. and these occupy more space, hence the boll diameter is More information on these two characters is highlydesirable, because of their economic importance. The loculi of the ovary.—The inheritance of thismeristic character is o
The cotton plant in Egypt, studies in physiology and genetics . ny possible modality in the diagram we found the valuefor correlation between these two characters in Fg to ber= 0-331 (± 0-061). The explanation is presumablymechanical; the bolls with more loculi have more septa, Charara King : M \ :?? / \ r j \, \J ^ v 50 0-60 0-70 Wjdtji Length Fig. 62.—Form of the Boll. and these occupy more space, hence the boll diameter is More information on these two characters is highlydesirable, because of their economic importance. The loculi of the ovary.—The inheritance of thismeristic character is of peculiar interest, since it is not acharacter of form, but of distribution, and analogous tosuch things as the number of ray-florets in the Compositce. A cross (Fig. 63) between an Upland with its mean at4-3 and an Egyptian with a mean at 3-0 produced anintermediate Fj with the formula 4-1. In F., this family M 2 164 THE COTTON PLANT IN EGYPT gave a range of SO to 4*7, with modes at 32, 36, 4*1,4-4, and possibly elsewliere. In F3 a 4*8 bred true to. •0 3-5 4-0 63 AND 64.—LocuLi of the Ovary. 5-0 48, and a 31 bred true to 32. On the other hand, 33 broke up into a scatter from 31 to 37, as did also a 3*6. A 39 plant appeared to breed true round a mean of 4T, IX HEREDITY 165 while a 3*8 scattered from 3-8 to 3*3. Similarly, a 4*0scattered from 39 to 3*2, and so on. On the data avail-able it seemed clear that the parental forms could beextracted and bred true, while the intermediate formsrepresented new gametic combinations which broke up innew ways, giving new forms. No large family havingbeen raised beyond Fo in this cross, we may examinethe data from another one. The AfifixTruitt cross had 2*8 and 4-5 as the parentalvalues (Fig. 64). The figure 4-5 is uncertain, because therewas every indication that the American parent waslieterozygote in this respect. The F^ had 3-6 loculi, andthe F., spread from 2-9 to 4*8. Only five F3 familieswere raised ; one of these wa
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Keywords: ., bookcentury1900, bookdecade1910, bookidcottonplanti, bookyear1912
