Chromosome Association and Giemsa C-banding of Meiotic Chromosomes in Interspecific Hybrid of Alstroemeria ligtu L. hybrid and A.pelegrina L. var. rosea, its Amphidiploid, and Sesquidiploid between the Amphidiploid and the Parents.
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Accession number;02A0274317
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| Title;Chromosome Association and Giemsa C-banding of Meiotic Chromosomes in Interspecific Hybrid of Alstroemeria ligtu L. hybrid and A.pelegrina L. var. rosea, its Amphidiploid, and Sesquidiploid between the Amphidiploid and the Parents. |
| Author;
ISHIKAWA T
(Saitama Prefecture Agriculture And Forestry Res. Center, Saitama, Jpn)
ISHIZAKA H
(Saitama Prefecture Agriculture And Forestry Res. Center, Saitama, Jpn)
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Journal Title;Breed Sci
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Journal Code:Y0311B
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ISSN:1344-7610
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VOL.52;NO.1;PAGE.27-33(2002)
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| Figure&Table&Reference;FIG.3, TBL.4, REF.18 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Alstroemeria ligtu L. hybrid(LH, 2n=2x=16), A.pelegrina L. var. rosea(PR, 2n=2x=16) and their interspecific hybrids(2n=2x=16, 3x=24, 4x=32) were analyzed cytologically. In the parental species, the mean chromosome association per pollen mother cell(PMC) at metaphase I in meiosis was 0.04 I + 7.98 II in LH and 0.08 I + 7.96 II in PR. Meiosis proceeded normally in these 2 species and pollen fertility was 98.4% in the former and 94.9% in the latter. These 2 species produced many normal seeds by self-pollination. The hybrid(2n=16) showed partial chromosome association with a mean of 11.18 I + 2.41 II. Abnormal chromosome behavior such as the formation of bridges and micronuclei was observed frequently at anaphase I and II of PMCs or at the early uninucleate stage of microspores, which resulted in low pollen fertility(0.6%). The hybrid did not produce any normal seeds when self-pollinated or backcrossed with either parent. In the amphidiploid(2n=32), the mean chromosome association per PMC was 0.82 I + 15.59 II at metaphase I and pollen fertility was 86.3%. Although the amphidiploid did not produce any normal seeds by self-pollination, it produced normal seeds by the reciprocal crosses with LH. The mean chromosome association in the sesquidiploid(2n=24) of LX * the amphidiploid was 8.24 I + 7.85 II + 0.02 III and that or PR * the amphidiploid was 8.58 I + 7.66 II + 0.03 III. These sesquidiploids frequently showed chromosome bridges and micronuclei at anaphase I and II of PMCs or at the early uninucleate stage of microspores, and pollen fertility was 14.8% in the former and 13.0% in the latter.... (author abst.) |
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