UNILATERAL INCOMPATIBILITY Crops Research 1, 1964 between discrete pop - PDF document

UNILATERAL INCOMPATIBILITY Crops Research 1, 1964 between discrete popu- in that reciprocal crossing combinations (1961 b) found a very similar response except limited self-fertility were always and DARBY (1955) suggested that mutation and U1 has only recently unilaterally with “primitive” self-fertile retained certain arose. L~BWIS pollen-tube inhibition such inhibition. reactions, even families, followed the general cannot explain U1 between self-incompatible or the step-wise or complex discrepancies, however 1963). This hypothesis states is not sufficiently complemented growth stimulation pollen. Balances controlled by polygenic systems. approaches: studies genetic control genetic control in the Bonpl. was these studies because its wide U1 among lines low level embryo abortion; and other barriers within two botanical forms, self-fertile and one the present study. These lines unilaterally with line referred to herein Balios is a self-fertile f. here, but Surco, came from the Twenty-five plants grown from the 50 seeds geographic source accession is This line has proved difficult to its progeny inbred generations were for this third line, from north lines were supplied to plants were grown stage and within 24 were not before pollination, but were maintained. five flowers per plant were often repeated. mature, and spread on compatibility were per fruit. indices could been used, such fruits per per pollination. However, these factors such cluster, and available parent, the three possible crosses against pollen parent, and with the original parents. Pollinated styles pollen-tube growth. were grown, during different fruit, whether male and female fer- patible directions. for fertility, representa- family were hybrids were although mean the parents. Surco were cross-compatibility reactions compatibilities did not did not a short- Fruit- and was most This parental as pollen were grown plantings each, but occurred. Classification incompatibility were usually Female parents Sib Crass 31.5 29.7 parentheses represents classification and __ __ cross-compatibility was very strong set was seldom over per fruit slightly fertile which were clearly incompatible plants with respect to seeds Cajamarca; (C) produced by winter planting; UNILATERAL INCOMPATIBILITY were made. These direction as might have pollen selection. chiefly on recurrent parent than the Cajamarca tended to were partially that the more appropriate to these plants and unilateral 10 were seeds) type, obtained, those progenies did not segregate and partial compatibility) a greater plants were with no pseudocompatibility, selection incompatibility to fer- This parental was used different botanical forms. were grown was grown were similar found to fertile but unilaterally gene models Chi-square value pollination Incompatible 13 0.63 Two dominant genes necessary to sib Two dominant genes necessary for incompatibility, to pseudocompatible genes necessary incompatibility but both alleles chi-square calculation deviation from model. only only 11 11 16 3 plants with respect to per fruit family (1962). plantings were more two types the 1962 winter planting out this and are suggest, however, that are paternal trait, be self-incompatible UNILATERAL INCOMPATIBILITY Seeds per fruit after self- hybrid Self-pollination Baiios Surco Baiios Surco 2 4.3 16.1 16.7 21.5 10.6 5.1 33.5 20 13.5 Correlations among crossing behavior crossing behavior compared group was fertility with (16.85 versus 11.63 plants representing months for plants retained segregated both SI and UI. was as were strongly affected by contrast to data strongly suggest polygenic plants for different ways parents. Actually, female Surco were poorly compatible, fall and winter for compatibility in Figure Certain features were common to First, all had plants with male compatibility were (for all Furthermore, all bimodal. One mode always represented incompatible combinations, partial fertility. was no tionship between enies. However, progenies were slightly Surco. Influence but the were not extensive enough to discriminations. One- representative group or U1 was studied Extensive pollinations were not percent alpha- pollination resulted for compatibility uarious first Recurrent parent only Nelthei families obtained with male Although detailed data were not varied considerably. several progenies prevented a realistic analysis for two crossing studies the inheritance two related but unique botanical forms one direction, such as However, conditions particularly temperature, cause some and may continuous distribution fertility measurements Bafios to unilateral barriers tended to break down, segre- a few plants were reciprocally compatible with one limited self-fertility unifying feature and minor from the gation occurred even as manifest plants. Although by the more uniform due only progeny, probably two domi- account for also fits reported herein Surco differed the male parent self-fertile. Nevertheless, Surco agreed with the and that depression occurred this introduction wild. Surco corresponds its general CROWE (1958) in the were similar their fertility were present to say, plants among the indicates genes likely contributed by the genes affecting patibility were would suggest could be otherwise. Or, bimodality threshold effect, Nevertheless, U1 were usually were found to gest some genetic control. However, inhibition, appears major and minor a new polygenic modification even Polygenes could that the stylar and pollen components reaction could MARTIN (1963) polygenic balances effecting pollen reactions could lead to for- incompatibilities between demonstrated herein, can rapidly break down such viewed as polygenic phenomenon, the apparent reconcilable. Stepwise between self-incompatible SI mechanism. Finally, polygenic systems gene fixation hybridization, can genic modification SI and breeding systems isolated series some pseudocompatibility both self- UNILATERAL INCOMPATIBILITY polygenic modifiers growth strongly could not easily one dominant Surco was values suggested segregation which regulate growth interactions stylar or stable combinations, segregating, give rise to a D. DEWINTON, genetic analysis tween self-sterility incompatibility alleles species isolation tuberous Solanum. Agron. A. DARBY, 1955 LEWIS, D., CROWE, 1958 Lycopersicon esculentum Bonpl. complex. Evolution 1943 Specific differences RICK, 1954 Lycopersicon sect. Interspecific incompatibility 1953 Studies STOUT, A. and hybrids with Petunia. Mem. Botany Club