メヒシバ,ヒメイヌビエ,シロザの出芽後出穂・着蕾までの日数に対する日長と気温の効果

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The analysis of the environmental factors which are related to the duration of the period from emergence to heading or flower-bud formation is an important approach to understand the reproductive strategy of weeds. Therefore, a simple model that can predict the dates of heading or flower-bud formation in D. adscendens. E. crus-galli and C. album was developed by computing the daily daylength and mean air temperature after emergence. That is, DVS( n ) =ΣDVR( i ) ・・・・・・・・・・・・・・・・・・・・・・・・・(1) DVR( i ) =aL( i ) +bT( i ) + c ・・・・・・・・・・・・・(2) where DVS ( n ) is the developmental stage at n-th day after emergence ; DVS is zero at the onset of emergence, 1.0 at heading or flower-bud formation ; DVR ( i ) is the developmental rate at i-th day after emergence ; L (i) and T (i) are the daylength (hr) and mean air temperature (℃) of i-th day, respectively ; a, b and c are parameters. The value of the parameters was determined by multiple regression analysis based on data of field experi-ments. The results obtained were a= -0.0076, b=0.0018 and c= 0.091 for D. adscendens, a= -0. 0071, b=0.0014 and c=0.093 for E. crus-galli and a=-0.0137, b=0.0023 and c=0.156 for C. album. The prediction by the above-mentioned model showed a good fit to the values observed based on field experiments carried out for three consecutive years and the phytotron experiments (daylength = 12hr, temperature = 25℃). The relation between the duration of the period from emergence to heading or flower-bud formation and seed production characteristics of weeds was discussed.
日本雑草学会の論文
1989-05-30

メヒシバ,ヒメイヌビエ,シロザの出芽後出穂・着蕾までの日数に対する日長と気温の効果

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