報告書番号

486019

タイトル（和文）

アマモへの温度の影響 Ⅱ．栄養株の生長と有性生殖

タイトル（英文）

EFFECTS OF TEMPERATURE ON ZOSTERAMARINA L. 2.VEGETATIVE GROWTH AND REPRODUCTION

概要 （図表や脚注は「報告書全文」に掲載しております）

アマモ場の季節的消長と温度との関係についての基礎的知見を得るため，アマモの栄養生長および有性生殖と温度との関係について明らかにした。結果は以下の通りであった。１．栄養株の生育下限温度は１０℃よりも低く，生育上限温度は２５℃と３０℃の間にあることが明らかになった。２．葉の生長率は１０～２０℃の間で温度に比例して高くなり，２０～２５℃の間で低下した。３．草丈は１５～２５℃の間ではあまり差がなく，１０℃ではそれらよりやや長かった。４．分枝数は１５～２０℃で高く，１０℃と２５℃では低かった。５．１０℃と２０℃以上では異常花穂の割合が高かった。６．結実花穂の割合は１５℃も最も

概要 （英文）

WE HAVE EXAMINED THE EFFECT OF TEMPERATURE ON VEGETATIVE GROWTH AND REPRODUCTION OF EELGRASS IN LABORATORY EXPERIMENTS TO DEFINE THE RELATIONSHIP BETWEEN SEASONAL CHANGE OF EELGARASS ANDTEMPERARTURE.RESULTS1.SURVIVAL RATE MOST OF THE VEGETATIVE SHOOTS WHICH WERE COLLECTED IN DECEMBER 1981,FEBRUARY,MAY AND OCTOBER 1982 SURVIVED MORE THAN 2 MONTHS BELOW 25GRADIENT.BUT,ALL OF THE SHOOTS DIED WITHIN8WEEKS AT 30GRADIENT. SURVIVAL RATES OF VEGETATIVE SHOOTS WHICH WERE COLLECTED IN AUGUST 1982WERE LOWER THAN THOSE COLLECTED AT OTHER TIMES ATALL TEMPERATURES TESTED.ALL SHOOTS DIED WITHIN 2WEEKS AT 25GRADIENT.2.VEGETATIVE GROWTH SPECIFIC GROWTH RATES FOR LEAVES INCREASED WITH INCREASING TEMPERATURE UPTO 20GRADIENT AND DECREASED WITH INCREASING TEMPERATURE FROM 20GRATIENT TO 25GRADIENT.SHOOT HEIGHT OF EELGRASS AFTER 2MONTHS CULTURE AT VARIOUS TEMPERATURES WERE SHORTER THAN THE INITAL LENGTH AT ALL TEMPERATURES.AND SHOOT HEIGHT AT 10GRADIENT WAS LONGER THAN AT OTHER TEMPERATURES.THE MAXIMUM VALUES FOR NUMBER OF SHOOTS,NUMBER OF RHIZOME NODES AND LENGTH OF RHIZOME,AND LENGTH OF THE LONGEST ROOT OF VEGETATIVE SHOOTS,WHICH WERE CULTURED AT VARIOUS TEMPERATURES FOR 2MONTHS,WERE OBSERVED AT 15 20GRADIENT,20GRADIENT,15 20GRADIENT 10 20GRADIENT RESPECTIVELY.3.FLOWERING,POLLINATION AND FRUITING NUMBERS OF SPATHES PER FLOWERING SHOOT,WHICH WERE CULTURED AT VARIOUS TEMPERATURES FOR 30DAYS,WERE HIGH AT 18 23GRADIENT.PERCENTAGE OF ABNORMAL SPADIX,WHICH HAD BROWN OR UNRIPEND THECAE,WERE HIGH AT 10GRADIENT AND OVER 20GRADIENT.PERCENTAGE OF SEED FORMING SPADIX WAS THE HIGHEST AT 15GRADIENT AND NO SEED FORMED AT 10GRADIENT AND OVER 23GRADIENT.FROM THESE RESULTS,WE CONCLUDEDTHAT 15 20GRADIENT IS THE MOST FAVOURABLE TEMPERATURE RANGE FOR VEGETATIVE GROWTH AND REPRODUCTION OF ODAWA BAY EELGRASS. VEGETATIVE GROWTH AND REPRODUCTION WOULD BE AFFECTED BY INCREASING TEMPERATURE IN EXCESS OF 25GRADIENT AND 23GRADIENT RESPECTIVELY OR BY DECREASING TEMPERATURE BELOW 10GRADIENT.

報告者

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