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バレイショ根系の品種間差異と地上部の生育および塊茎収量との関係

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Title: バレイショ根系の品種間差異と地上部の生育および塊茎収量との関係
Other Titles: Varietal Differences in Root System and its Relationship with Shoot Development and Tuber Yield
Authors: 岩間, 和人1 Browse this author
中世古, 公男2 Browse this author
後藤, 寛治3 Browse this author
西部, 幸男4 Browse this author
梅村, 芳樹5 Browse this author
Authors(alt): Iwama, kazuto1
Nakaseko, Kimio2
Gotoh, Kanji3
Nishibe, Yukio4
Umemura, Yoshiki5
Issue Date: 30-Sep-1979
Publisher: 日本作物学会
Journal Title: 日本作物學會紀事
Volume: 48
Issue: 3
Start Page: 403
End Page: 408
Abstract: バレイショ根系の品種間差異,ならびに地上部の生育と塊茎収量との相互関係を明らかにするため,早晩性を異にする 10 品種(系統)を島松,札幌の2ヶ所で慣行条件下に栽培し,主要生育時期に根および地上部の形態的形質ならびに乾物重を測定した. 1. 根数,最大根径および根乾物重は,いずれの品種もほぼ開花始に最大となり,種いも基部に太い根が多く分布していた.また,各形質とも品種の間には1%水準で有意な差異がみとめられ,地下部上位節の根数および最大根径,ならびに株当根乾物重は晩生品種ほど大きい傾向が認められた. 2. 株当の根数および根乾物重は,茎数と一茎当の根数および根物重の2要因に分けられるが,株当根数は茎数と,株当乾物重は1茎当根乾物重とのみ有意な正の相関を示した. 3. 全葉展開期における最大根径および根乾物重は,茎長,茎径および主茎葉数と有意な正の相関を示した.一方,根数は茎数とのみ有意な正の相関を示したものの,茎数の影響を除いた一茎当根数は茎長,茎径および主茎葉数と正の相関を示した. 4. 根乾物重は,いずれの品種も島松に比べ札幌で大きく推移したが,その最大値は早生品種に比べ晩生品種が大きかった.また,札幌では晩生品種は開花始以降も根乾物重が増加したが,その最大期はいずれの品種も茎葉に比べ早く,根乾物重の大きさは茎葉に比べ,より早期に決定されることが明らかになった. 5. 生育前期の四葉期から開花始に至る間の乾 物生産特性について検討してみると,個体当乾物増加速度の品種間差異は比較的小さかった.しかし,根の乾物増加速度および乾物分配率はいずれも晩生品種で大きく,両者の間には r = 0.976***の正の相関が認められ,開花始までに明確となる根乾物重の品種間差異は品種の早晩性に基づく乾物分配率の違いによることが明らかになった. 6. 開花始および全葉展開期における根乾物重と塊茎収量との間には,いずれも有意な正の相関が認められた.しかし,塊茎収量は全葉展開期における茎葉乾物重とも強い正の相関を示すほか,茎葉乾物重および塊茎収量はいずれも晩生品種ほど大きいことから,塊茎収量と根乾物重との間に認められる相関関係は直接的なものではなく,品種の早晩性に基づく茎葉の繁茂特性を介した間接的なものと解される.
Ten varieties were grown under the field conditions at the two locations, and number, diameter and dry weight of root were measured at the 4th leaf stage, the initial flowering stage and the full leaf expanding stage. The results obtained are summarized as follows: 1. Number, diamcter and dry weight of root attained to the maximum value about the initial flowering stage, and maximum diameter and dry weight of root were greater in late varieties than in early ones. 2. Number of roots per plant indicated a positive correlation with shoot numbcr (r=0.743), but dry weight of root per plant was correlated with dry weight of root per stem (r=0.792), not with shoot number. Moreover, maximum root diameter and dry weight of root correlated positively with stem length, number of leaves on main stem and stem diameter. 3. Root dry weight of each variety reached the maximum value several weeks earlier than shoot dry weight at each location. 4. During the period from the 4th leaf stage to the initial flowering stage, there were distinct differences among varieties in root and tuber growth rates. The growth rates in late varieties were higher in root, but lower in tuber, compared with early ones, and there was a highly negative correlation between them. However, varietal differences in growth rate per plant were very litte except Shimakei No. 161, and not related with the earliness. In addition, growth rates in each organ were correlated with their distribution ratios, not with growth rate per plant. 5. Root dry weight was significantly correlated with tuber yield. However, leaf and stem dry weight were greater in late varieties than in early ones and showed also highly significant correlations with tuber yield. Therefore, it was assumed that the relationship between root system and tuber yield was not due to the direct contribution of root system, but due to the pleiotropic expression of the earliness.
Type: article
URI: http://hdl.handle.net/2115/47005
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 岩間 和人

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