著者

Shamimul Alam Sheikh Katsuhiko Kondo Yoshikazu Hoshi

出版者

日本メンデル協会、国際細胞学会

雑誌

CYTOLOGIA (ISSN:00114545)

巻号頁・発行日

vol.60, no.1, pp.43-47, 1995-03-25 (Released:2009-03-19)

参考文献数

11

被引用文献数

24 50

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Drosera dichrosepala was exposed to different doses of Gamma radiation. Fragmented and fused chromosomes were observed as a consequences. Diffused centromeres in every fragment chromosome was detected by centromeric banding (Cd-banding) and was supported by its typical disjunction and totally lack of lagging chromosomes or micronuclei from anaphase to telophase. C-banding revealed that the fragment chromosomes were highly heterochromatic and fragmentation might be occurred at the terminal regions of chromosomes. Fluorescent banding suggested that most of the fragment chromosomes were rich in GC base composition in the species. Alteration of karyotype due to Gamma irradiation also indicated that spontaneous fragmentation or fusion of chromosomes might be a possible factor for promoting the bimodal karyotype in this genus.

著者

Kazufumi Nagata Yasunori Nonoue Kazuki Matsubara Ritsuko Mizobuchi Nozomi Ono Taeko Shibaya Kaworu Ebana Eri Ogiso-Tanaka Takanari Tanabata Kazuhiko Sugimoto Fumio Taguchi-Shiobara Jun-ichi Yonemaru Yusaku Uga Atsunori Fukuda Tadamasa Ueda Shin-ichi Yamamoto Utako Yamanouchi Toshiyuki Takai Takashi Ikka Katsuhiko Kondo Tomoki Hoshino Eiji Yamamoto Shunsuke Adachi Jian Sun Noriyuki Kuya Yuka Kitomi Ken Iijima Hideki Nagasaki Ayahiko Shomura Tatsumi Mizubayashi Noriyuki Kitazawa Kiyosumi Hori Tsuyu Ando Toshio Yamamoto Shuichi Fukuoka Masahiro Yano

出版者

Japanese Society of Breeding

雑誌

Breeding Science (ISSN:13447610)

巻号頁・発行日

vol.73, no.3, pp.332-342, 2023 (Released:2023-07-27)

参考文献数

64

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Many agronomic traits that are important in rice breeding are controlled by multiple genes. The extensive time and effort devoted so far to identifying and selecting such genes are still not enough to target multiple agronomic traits in practical breeding in Japan because of a lack of suitable plant materials in which to efficiently detect and validate beneficial alleles from diverse genetic resources. To facilitate the comprehensive analysis of genetic variation in agronomic traits among Asian cultivated rice, we developed 12 sets of chromosome segment substitution lines (CSSLs) with the japonica background, 11 of them in the same genetic background, using donors representing the genetic diversity of Asian cultivated rice. Using these materials, we overviewed the chromosomal locations of 1079 putative QTLs for seven agronomic traits and their allelic distribution in Asian cultivated rice through multiple linear regression analysis. The CSSLs will allow the effects of putative QTLs in the highly homogeneous japonica background to be validated.

著者

Djauhar Asikin Tsuyoshi Motohashi Katsuhiko Kondo

出版者

International Society of Chromosome Botany

雑誌

Chromosome Botany (ISSN:18815936)

巻号頁・発行日

vol.9, no.3, pp.89-96, 2014 (Released:2014-09-16)

参考文献数

6

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The combination of BA and NAA in concentration at 0-4 mg/l could not significantly induce shoot primordia in four endangered species of orchids. Size of shoot meristem used in the preliminary research might be too big to induce shoot primordia in Grammatophyllum speciosum and for increasing the survival frequency of Vanda and Phalaenopsis. Certain concentrations of BA and NAA affected the survival frequency of Vanda and Phalaenopsis. The type of basal medium has no effect to the growth and the survival frequency of the orchid studied, except for Phalaenopsis gigantea which only grow well in Hyponexpepton medium. The chromosome numbers of the four orchid species showed very high stabilities during the courses of their micropropagations.