フラサバソウとオオイヌノフグリの生殖生態 Reproductive Ecology of Veronica hederaefolia L. and V. persica Poir

この論文にアクセスする

この論文をさがす

著者

抄録

ワラサバソウとオオイヌノフグリは百数十年、あるいはそれ以前に帰化した同属の類似種である。ワラサバソウの密な分布域は狭く、オオイヌノフグリとは対照的である。本報では両種の生殖生態を比較して、分布との関係を考察した。両種は自動的に自家受精した。また他殖も可能であった。単為結実はしなかった。筑紫野市原と、8 km離れた同市原田の自生群落(それぞれA、B群落とよぶ)で採取した両種の幼植物(A、B植物)を育て、袋掛けによって自殖種子S_A、 S_Bをえた。またA群落から放任採種した。さらにそれぞれ種内の人工交配によって他殖種子F_1(A×B)をえた。以下便宜上系統とよぶ。これら2雑草の各4系統を、それぞれラテン方格法で比較栽培した。生育量や種子生産数について、オオイヌノフグリでは4系統間に顕著な差はなかった。ワラサバソウでは、 S_A、 S_BはF_1(A×B)に比べ有意に少なく、近交弱勢を認めた。それ故、本種は1個体孤立して生じても、弱勢のために生存と繁殖ひいては定着に不利であろう。両種の自生群落で訪花昆虫を採集したところ、3目37種におよんだ。

Both species belong to the same genus and resemble each other. They migrated and became naturalized to Japan separately 100 and several decades or more ago. Area with dense distribution of Veronica hederaefolia is very limited in contrast to that of V. persica. Reproductive ecology in both species was studied and the relationship between the ecological conditions and distribution was discussed in this paper. Both species reproduce autogamously (Table 1) and allogamously, and do not produce seeds by parthenogenesis (Table 1). Some young plants of both species were collected from volunteer communities in Haru and Harada (A and B communities respectively) in Chikushino. The two locations were 8 km apart from each other. The A and B plants were grown and selfed seeds "S_A and S_B " were obtained by bagging while open pollinated seeds "Open A" were collected from the A communities. Crossed seeds "F_1 (A×B)" were obtained by artificial crossing in the respective species. The four kinds of seeds of each species were sown and the growth ability of the plants was compared (Table 2). No significant differences were recognized in the growth rate and seed numbers in the four groups of V. persica plants, whereas in the case of V. hederaefolia the values of these parameters were significantly reduced in the SA and SB Plants compared with the F1 (A× B) plants. Inbreeding depression was recognized. This species is considered to show unfavorable characteristics for survival, propagation and colonization when individuals grow in isolation. Thirty seven species of insects belonging to 3 orders were collected on the flowers of both plant species in the A communities (Table 3).

収録刊行物

  • 雑草研究

    雑草研究 39(2), 85-90, 1994-08-05

    日本雑草学会

被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    110003932027
  • NII書誌ID(NCID)
    AN00097258
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    0372798X
  • NDL 記事登録ID
    3895611
  • NDL 刊行物分類
    RB17(農産--病虫害・農薬・検疫)
  • NDL 雑誌分類
    ZR7(科学技術--農林水産--農産)
  • NDL 請求記号
    Z18-599
  • データ提供元
    CJP引用  NDL  NII-ELS 
ページトップへ