Search Results:　 1-20 of 28

1

Pollination Efficiency of Bumblebee Queens and Workers in the Alpine Shrub Rhododendron aureum

Kudo Gaku , Hirao Akira S. , Kawai Yuka

… The fruit to flower ratio per inflorescence was lower in early-snowmelt populations due to quantitative pollen limitation, while the seed to ovule ratio per fruit was lower in late-snowmelt populations. …

International Journal of Plant Sciences 172(1), 70-77, 2011-01-00

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2

Genotypic variation for floral characters in Brassica and allied genera with special reference to breeding system

Takahata Yoshihito , Konno Noboru , Hinata Koukichi

… The five floral characters, i.e., number of pollen grains per flower, pollen grain diameter, anther length, number of ovules per flower and pollen-ovule ratio (P/O), were studied on 119 strains of 53 species in Brassica and allied genera with respect to the breeding system. …

Breeding science 58(4), 385-392, 2008-12-00

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3

Pollen production of Someiyoshino, Prunus × yedoensis [in Japanese]

ASHIHARA Masakatsu , SAITO Hideki

… The numerical ratio of pollen grains to an ovule (P/Ov ratio) was 25.8-32.5 x 10^3 , as there are two ovules in each flower. …

日本花粉学会会誌 54(1), 23-27, 2008-06-30

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4

Factors of Poor Fruit Set in New Peach Cultivar 'Shimizu Hakuto RS' Developed by Radiation Breeding(Human Issues & Methodology in Horticulture) [in Japanese]

Fujii Yuichirou , Otsuka Masako , Okamoto Goro , Hihara Seisuke , Kagami Hiroshi

放射線育種により作出されたモモ'清水白桃RS'は,原品種の'清水白桃'と比較して果実品質は同等であるが,結実率が低い.開花30日後の結実率を調査したところ,'清水白桃'が平年では50〜70%であるのに対し,'清水白桃RS'は20〜30%と著しく低かった.花器の形態的観察を行ったところ,'清水白桃RS'には胚珠や胚のうの未発達や退化など形態的異常の花が多く存在しており,これが結実率の低下を引き起こし …

Horticultural research (Japan) 6(2), 307-311, 2007-04-15

CiNii Fulltext PDF - Open Access Japanese Agricultural Sciences Index References (14) Cited by (2)
5

Estimating the Inheritance for Parthenogenesis in Tetraploid Chinese Leek (Allium ramosum, syn. A. tuberosum) [in Japanese]

Nakazawa Yoshiko , Namai Kiyoshi , Kojima Akio , Kobayashi Shunichi , Tasaki Kimihisa , Amagai Masayuki

ニラのアポミクシス(複相大胞子形成と単為発生から構成される)の遺伝様式を解明する手がかりを得るため,アポミクシス四倍体ニラ(Allium ramosum, syn. A. tuberosum 2n=32)の交雑集団において,胚珠観察法を用いて単為発生を調査した結果,10個体の非単為発生個体を選抜することができた.フローサイトメーターによる倍数性調査を行ったところ,全個体が四倍体であった.9個体の非 …

Breeding research 8(3), 89-98, 2006-09-01

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6

Pollen production of a Quercus phillyraeoides stand in Shodo-shima Island, Kagawa [in Japanese]

SAITO Hideki , OHKUBO Masatoshi , KUNITOMO Junko

… Annual fluctuation of the pollen yield during 3 years was small, as the ratio of the maximum to minimum value was 2.0. …

日本花粉学会会誌 52(1), 47-52, 2006-06-30

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7

Pollen production in a young Alnus sieboldiana community growing on dumped detritus [in Japanese]

SAITO Hideki

… The actual numerical ratio of pollen grains to ovules (P/Ov ratio) was 50〜60×10^3, compared with a potential ratio of 70〜100×10^3. …

日本花粉学会会誌 52(1), 41-45, 2006-06-30

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8

Pollen production of a Camellia japonica stand in Ise, Mie prefecture : quantification of pollen borne in flowers [in Japanese]

SAITO Hideki

… The numerical ratios of pollen grains to a single ovule (P/Ov ratios) were calculated to be 59-89×10^3, as there are 3 loculi per ovary and 4 to 6 ovules in each loculus. …

日本花粉学会会誌 52(1), 35-39, 2006-06-30

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9

Pollen production in a young Clerodendrum trichotomum plantation [in Japanese]

SAITO Hideki , OGAWA Yumeko

… The ratio of pollen grain number to a single ovule was calculated to be 3,459 grains, as there were 4 ovules per flower. …

日本花粉学会会誌 51(2), 81-85, 2005-12-31

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10

Pollen production rates in a young Albizia julibrissin plantation [in Japanese]

MIKOZAWA Yoshiko , SAITO Hideki

苗畑(京都府大構内, 京都市左京区下鴨)に植栽した若いネムノキ群落(樹齢7年生)においてネムノキ花粉の土地面積当り生産量を粒数と乾重量とで調査した.まず開花前の花試料を本群落内の4本から採取して花粉量を測定した.雄ずい当りの平均花粉塊(16花粉・小胞子粒)は6.85個, 花粉粒では110個, 重量は0.00988mgであった.これらの値から花粉塊1個の平均重量は1.4×10^<-3>m …

日本花粉学会会誌 51(1), 21-24, 2005-06-30

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11

Research on self fertilization in Lilium formosanum Wallace [in Japanese]

Inagaki Hidehiro

日本に帰化し,テッポウユリ亜属の中で特異的に雑草性を示すタカサゴユリの自殖性について検討し,次のことを明らかにした。1)タカサゴユリは同じテッポウユリ亜属のテッポウユリやササユリに比べてP/O比(花粉数/胚珠数比)が小さく,自殖性が高いと考えられた。2)自殖種子では他殖種子と比較して発芽率が低く,より強い休眠性を示した。また,自殖種子から発芽した第一代はほとんど弱勢が認められず,むしろ生育量は他殖 …

Journal of Weed Science and Technology 47(3), 147-152, 2002-09-30

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12

Pollination Systems Inferred from Pollen-Ovule Ratios of Some Species of Podostemaceae

OKADA HIROSHI , KATO MASAHIRO

… Pollen-ovule ratios (P/O) of 20 species in 15 genera in the family were calculated and pollination in some species was observed. … We therefore conclude that species with values of log P/O higher than 2.5 are allogamous, while those with a ratio lower than 2.0 are autogamous. …

APG : Acta phytotaxonomica et geobotanica 53(1), 51-61, 2002-06-29

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13

Cleistogamy in Scutellaria rubropunctata Hayata(Labiatae) from the Ryukyu Archipelago.

傳田哲郎

The Biological magazine,Okinawa (40), 7-14, 2002-06-00
14

The Distinction of Five Taxa of the Arisaema undulatifolium Group (Araceae) in Western Japan

KOBAYASHI TOMIKI , MURATA JIN , WATANABE KUNIAKI

ナガバマムシグサ群内の5分類群に属する,西日本の10集団及び関東地方の1集団,併せて356個体について,雌雄株に分けて小葉数,花梗,葉柄及び偽茎の長さを計測し,また8集団の45個体について子房あたりの胚珠数を算定し,次のことを明らかにした。1)タカハシテンナンショウの雌個体を除き,小葉数と葉柄に対する花梗の長さの比はこの研究で採用した分類群のまとまりと最もよく対応しており,分類群内では有意な差がな …

Acta phytotaxonomica et geobotanica 51(1), 57-66, 2000-09-12

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15

Self-pollination and Pollen Germination in Japanese Morning Glories (Ipomoea nil)

Miyajima Daiichiro , Karito Ikumi , Fujisawa Rieko

アサガオ(Ipomoea nil Roth.)'暁の紫'を用いて自家受粉機構と柱頭上での花粉発芽について調べた.つぼみ内でやくは柱頭より下位に位置していたが, そのうち90%のものは開花後柱頭の上位に位置した.アサガオは開花の過程で自動的に自家受粉を行い, 約40粒の花粉が柱頭に付着した.柱頭上での花粉発芽率は17%であった.花粉胚珠比は180で, 十分量の花粉での人工授粉と袋かけ状態での自発的な …

Journal of the Japanese Society for Horticultural Science 69(1), 66-68, 2000-01-15

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16

Relationships between Pollen-ovule Ratio and Autofertility, Self-Compatibility, Automatic Self-Pollination Ability in Heterogeneous Incomplete Autogamous Plants, Thai Mustard

Yashiro Kazutoshi , Sakai Yoriko , Namai Hyoji

… It is generally recognized that the pollen-ovule (P/O) ratio is correlated with the breeding system of plant species; … the higher the P/O ratio, the lower the autogamy among species. … We analyzed the correlation between the hreeding system and P/O ratio in a Thai mustard cv. …

Breeding science 49(1), 39-42, 1999-03-00

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17

Reproductive Characteristics of Amphidiploids Derived from an Interspecific Hybrid between Nicotiana trigonophylla Dun. and N. tabacum L.

Chung Chan Sun , Yoshida Kaoru T , Takeda Genkichi

胚珠培養を用いて作出した Nicotiana trigonophyzla Dun.とN.tabacum L. の種間雑種からコルヒチン処理により複二倍体を作出した.コルヒチン処理した個体のうち,8個体の染色体数は2n=72であり(Fig1),これは両親の染色体数の合計に等しく,複二倍体であると考えられた.複二倍体は両親の中間的形態を示し,コルヒチン処理を行っていないF_1雑種個体とよく似ていた(F …

Breeding science 46(1), 29-33, 1996-03-00

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18

Breeding System, Sex Ratio and Individual Size of the Gynodioecious Nototriche compacta (Malvaceae) in the Andes of Central Chile

GARCIA-FRANCO JOSE G. , ARROYO MARY T. KALIN

… We studied the breeding system, sex ratio and individual size in two populations localized in Cerro Franciscano in the Andes of Central Chile (33°19' S and 70°16' W, elevation 3400-3470 m). … Analysis of developed seeds and unfertilized ovule shows morph differences between treatments within and between populations. …

Plant species biology 10(3), 147-153, 1995-00-00

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19

Elongation of Pollen Tubes and Degeneration of Ovules in Japanese Chestnut(Castanea crenata Sieb. et Zucc.). [in Japanese]

Nakamura Masahiro

… Their ratio increased to 40% on 6 August and reached nearly 100% on 9 August. … But one well-developed ovule with an embryo of 0.037 mm in diameter was observed in each ovary on 9 August. … The ovule with such an embryo grew rapidly after 13 August.<BR>6. …

Journal of the Japanese Society for Horticultural Science 63(2), 277-282, 1994

Japanese Agricultural Sciences Index J-STAGE CrossRef Cited by (3)
20

Studies on development of reproductive organs in Orchidaceae with special reference to the genus Calanthe [in Japanese]

NAGASHIMA Tokiko

… The degrees of development were grouped into 4 types, such as only placenta, differentiated ovule primodium, differentiated embryosac and finished formation of ovule. … The time concerning to formation of ovule by pollen is earlier than the species having lower developmental stages. … As soon as finishing formation of ovule, the pollen tube penetrated through micropyle and elongated towards embryosac. …

Research bulletin 26, 1-85, 1993-03-00

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