Abstract
The viability, Al distribution in root apices, shoot growth, and excreted organic acid contents in blueberry cultured in vitro were examined to study the effects of aluminum (Al), calcium (Ca), and phosphate (P) ions on the plant's tolerance to Al. 1. Roots in the control, exposed to an Al-free acetate buffer were significantly damaged, but roots treated with 1mM Al or 1mM Al plus 1mM Ca retained their viability. 2. Al could not be detected in the root apex in the control, but the roots treated with 1mM Al and 1mM Al+Ca accumulated Al in the cortical area but not to the interior cortex as the treatment progressed. Thus, the accumulation of Al on the root surface seems to have protected the plant from the damage of low pH and acetate ions. 3. 1 mM Al in the medium hastened both the shoot and root growth for fifty days. The elimination of P from the medium inhibited root growth more than shoot growth. 4. The amount of organic acids excreted did not differ whether Al was present or not indicating that 1mM Al is not injurious. ハイブッシュブルーベリーのAl耐性に対するAl, Caおよびリン酸の影響を明らかにするため, in vitro培養で発根させたブルーベリーにAlおよびCa処理し, 根端細胞活性と根端部のAl分布を調査した.また, AlおよびPの有無培地で50日間培養し, 生長および根からの有機酸放出量を調査した.得られた結果は以下の通りである.1. 対照区(Al無添加, 酢酸緩衝液のみ)の根は, 根端部に著しく障害を受けたが, 1mM Al処理および1mM Al+Ca処理では処理前の根と同程度の活性を維持した.2. X線分析で, 根端組織のAl分布を測定した結果, 対照区の根にはAlの集積はみられなかったが, 1mM Al処理および1mM Al+Ca処理では, 根横断面の皮層部に処理日数とともにAlが集積していくことが認められた.根表面へのAl集積が低pHや酢酸イオンの影響を防いでいることが示唆された.3. 1mM Alを添加した培地はシュートおよび根の生長を対照区よりも促進した.またリン酸を欠如した培地ではシュートよりも根の生育が抑制されたが, リン酸欠如培地に1mM Alを添加した処理はリン酸欠如培地とは逆にシュートの生長が抑制された.4. 処理終了時における根から培地中への有機酸放出量は, いずれの有機酸とも処理間に有意差がなく, Alストレスによる増加は認められなかった.これらの結果は, 50日間の培養においても1mM濃度のAlは障害を誘導しないことを示した.
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Claims 11
Claim · model-written summary
Al-free acetate buffer damaged roots significantly.
Verbatim
e0“Roots in the control, exposed to an Al-free acetate buffer were significantly damaged”
t0“Highbush Blueberry”
Claim · model-written summary
Roots treated with 1mM Al retained viability.
Not reportedComparator
Verbatim
e0“roots treated with 1mM Al or 1mM Al plus 1mM Ca retained their viability”
t0“Highbush Blueberry”
Claim · model-written summary
Roots treated with 1mM Al plus 1mM Ca retained viability.
Not reportedComparator
Verbatim
e0“roots treated with 1mM Al or 1mM Al plus 1mM Ca retained their viability”
t0“Highbush Blueberry”
Claim · model-written summary
Al was absent from control root apices.
Not reportedDirection
Verbatim
e0“Al could not be detected in the root apex in the control”
t0“Highbush Blueberry”
Claim · model-written summary
Al accumulated in the cortex but not the inner cortex after Al treatment.
- Taxon
- blueberryt0
- Treatment
- 1mM Ale0
- Outcome
- accumulated Al in the cortical area but not to the interior cortexe0
Not reportedDirection
Verbatim
e0“the roots treated with 1mM Al and 1mM Al+Ca accumulated Al in the cortical area but not to the interior cortex as the treatment progressed”
t0“Highbush Blueberry”
Claim · model-written summary
Root-surface Al accumulation was proposed to protect against low pH and acetate damage.
Verbatim
e0“the accumulation of Al on the root surface seems to have protected the plant from the damage of low pH and acetate ions”
t0“Highbush Blueberry”
Claim · model-written summary
1 mM Al hastened shoot growth over fifty days.
Not reportedComparator
Verbatim
e0“1 mM Al in the medium hastened both the shoot and root growth for fifty days”
t0“Highbush Blueberry”
Claim · model-written summary
1 mM Al hastened root growth over fifty days.
Not reportedComparator
Verbatim
e0“1 mM Al in the medium hastened both the shoot and root growth for fifty days”
t0“Highbush Blueberry”
Claim · model-written summary
P elimination inhibited root growth more than shoot growth.
Verbatim
e0“The elimination of P from the medium inhibited root growth more than shoot growth”
t0“Highbush Blueberry”
Claim · model-written summary
Organic acid excretion did not differ with Al presence.
Verbatim
e0“The amount of organic acids excreted did not differ whether Al was present or not”
t0“Highbush Blueberry”
Claim · model-written summary
With phosphate absent, adding 1mM Al suppressed shoot growth.
Verbatim
e0“リン酸欠如培地に1mM Alを添加した処理はリン酸欠如培地とは逆にシュートの生長が抑制された”
t0“Highbush Blueberry”
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