研究のタイプ: 医学/生物学の研究 (experimental study)

[静磁界ばく露を受けたヒマワリ種子の発芽および初期生育の特性に関する影響] med./bio.

Effect on germination and early growth characteristics in sunflower (Helianthus annuus) seeds exposed to static magnetic field.

掲載誌: J Plant Physiol 2010; 167 (2): 149-156

この研究は、ヒマワリ(Helianthus annuus)の種子に静磁界ばく露を与え、発芽および実生への影響を調べた。静磁界磁束密度は、50 mTから250 mTまで50 mT刻みの5段階とし、ばく露時間は1時間刻みでの1時間から4時間までとした。擬似ばく露対照群を用いた。その結果、ばく露群では、種子の発芽速度、実生の長さ、および実生の乾燥重量が増加した;実験した条件の中では、50および200 mTで2時間ばく露で最高のパフォーマンスが得られた;静磁界ばく露を受けた種子では、種皮膜の完全性が向上し、細胞漏出および導電率が低下した;ばく露後に種子を土壌に植えて1か月の実生は、乾燥重量、根の長さ、根の表面積、および根の体積が対照群のものに比べ有意に大きかった;発芽中の種子におけるα-アミラーゼ、デヒドロゲナーゼおよびプロテアーゼ酵素活性は、対照群に比べてばく露群で有意に高かった、と報告している。

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研究目的(著者による)

To study the effects of various magnetic field strengths and durations on germination, field emergence and root development of sunflowers.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1:
  • DC/static
ばく露時間: continuous for 1 h, 2 h, 3 h or 4 h

ばく露1

主たる特性
周波数
  • DC/static
タイプ
  • magnetic field
ばく露時間 continuous for 1 h, 2 h, 3 h or 4 h
ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 two 16 cm long coils with a diameter of 9 cm and 3000 turns placed horizontally opposite each other with a gap of 5 cm between them; a cylindrical sample holder made of a non-metallic thin transparent plastic sheet placed between the coils;
Sham exposure A sham exposure was conducted.
Additional information field variation in the exposure area: 0.6 % horizontally and 1.6 % vertically for 50 mT 0.4 % horizontally and 1.2 % vertically for 250 mT
パラメータ
測定量 種別 Method Mass 備考
磁束密度 50 mT minimum 測定値 - -
磁束密度 100 mT - 測定値 - -
磁束密度 150 mT - 測定値 - -
磁束密度 200 mT - 測定値 - -
磁束密度 250 mT maximum 測定値 - -

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

Exposure of sunflower seeds to static magnetic fields significantly increased the speed of germination, seedling length and seedling dry weight under laboratory germination test conditions compared to control seeds. Among the various exposure combinations, 50 mT and 200 mT for 2 h yielded the peak performance: Seeds exposed to these treatments increased field emergence percent and dry weights in one month old plants. Root length, surface area and volume also increased in exposed seeds compared to the controls.
Exposure of seeds to static magnetic fields improved seed coat membrane integrity and reduced the cellular leakage and electrical conductivity.
In germinating seeds, enzyme activities of alpha-amylase, dehydrogenase and protease were significantly higher in exposed seeds compared to controls. The higher enzyme activities in static magnetic field exposed sunflower seeds are possibly responsible for the quick germination, improved seedling vigor and better root characteristics.
The improved functional root parameters suggest that magnetically exposed sunflower seed can be used in practical agriculture where better root growth will enable extraction of moisture from deeper soil layers.

研究の種別:

研究助成

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