報告書番号

U94030

タイトル（和文）

人工光下における遠赤色光の付加がインゲンマメの生長に及ぼす影響

タイトル（英文）

EFFECTS OF ENRICHING FAR-RED LIGHT ON GROUTHOF RUSH BEANS UNDER ARTIFICIAL LIGHTING

概要 （図表や脚注は「報告書全文」に掲載しております）

遠赤色光による植物の成長制御を目的に，光合成を主目的とした光源への遠赤色光の付加が，植物の成長量や形態が及ぼす影響を調べた。光合成に有効な光強度（ＰＰＦＤ）が一定の条件下で，遠赤色光を付加すると，インゲンの茎長と茎乾物重は，無付加の場合に比べて有意に大きく，それぞれ最大で１．７倍と１．５倍に増加した。葉の面積や乾物重ならびに数，茎の径や節数，根乾物重などは明らかな増加がみられなかった。また，４レベルのＰＰＦＤ区を設け，各々に遠赤色光付加区と無付加区を設定した。遠赤色光付加区は無付加区に比べて，４ＰＰＦＤレベルとも，茎長と茎乾物重が有意に大きく，付加区と無付加区の比はＰＰＥＦの増大に応じて変化した。ＰＰＦＤが５６ミューｍｏｌ／平方ｍ／ｓの場合には，その増加倍率は茎長では１．７倍，茎乾物重では１．３倍で，ＰＰＦＤの増大にしたがって茎長の増加倍率は減少し，茎乾物重の増加した。

概要 （英文）

IT IS WELL KNOWN THAT PLANT STEMS ELONGATE SIGNIFICANTLY WHEN THE FAR-RED LIGHT IS ENRICHED.WE CULTIVATED BUSH BEANS IN TWO GROWTH CHAMBERS UNDER ARTIFIC IAL LIGHTING,AND RESEARCHED THE EFFECTS OF ADDITIONAL FAR-RED LIGHT ON GROWTH,AND THE EFFECTS OF PHOTOSYNTHETIC PHOTON FLUX DENSITY(PPFD)ON GROWTH CHANGES CAUSED BY THE ADDITIONAL FAR-RED LIGHT,WITH THE OF REQULATING PLANT GROWTH USING FAR-RED LIGHT. WHEN THE PPFD WAS AT A STABLE LEVEL(76UMOL/SQUARE M/S),ADDITIONALFAR-RED LIGHT INCREASED THE STEM LENGTH AND STEM DRY WEIGHT OF BUSH BEANS SIGNIFICANTLY TO A MAXIMUM 1.7 AND 1.5 TIMES,RESPECTIVELY,COMPARED WITH CONTROLS.THE LEAF AREA AND LEAF DRY WEIGHT DID NOT SHOW APPARENT INCREASES. NO OBVIOUS CHANGES IN LEAF NUMBER,NODE NUMBER AND LEAF SHAPE(LENGTH TO WIDTH RATIO)WERE OBSERVED. THE PPFD WAS ADJUSTED TO FOUR LEVELS AND ADDITIONAL FAR-RED LIGHT TREATMENT AND CONTROLS WERE PREPARED FOR EACH PPFD LEVEL.THE PPFD LEVELS AFFECTED THE EFFECT OF ADDITIONAL FARRED LIGHT ON THE STEM LENGTH AND STEM DRY WEIGHT.THE STEM LENGTH AND STEM DRY WEIGHT UNDER ADDITIONAL FAR-RED LIGHT WERE SIGNIFICANTLY LARGER THAN THOSE OF THE CONTROLS FOR ALL FOUR PPFD LEVELS.THE INCREASE RARIO OF STEM LENGTH WAS 1.7 TIMES AND THAT OF STEM DRY WEIGHT WAS 1.3 TIMES AT 56 UMOL/SQUAR M/S PPFD.THE INCREASE RATIO OF STEM LENGTH DECREASED AND THAT OF STEM DRY WEIGHT INCREASED AS PPFD INCREASED. THE RESULTS SUGGEST THAT STEM GROWTH MIGHT BE REGULATED BY ADJUSTING FAR-RED LIGHT.

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