Abstract
This work establishes that cessation of root elongation of intact squash (Cucurbita pepo L.) plants is an early result of boron deficiency. Root elongation is slowed by 6 hours and is virtually stopped as early as 24 hours after boron is first withheld from the nutrient solution. As root elongation ceased, cell elongation progressed distally into the region normally occupied by the apical meristem and eventually the meristem became indistinguishable. Differentiation was determined by use of an elongation index in which cell length was compared to cell width. This index ranged from a low of 0.8 in boron-sufficient root meristems to a high of 3 in root meristems grown in a boron-deficient nutrient solution for 98 hours. It is concluded that a continuous supply of boron is not essential for cell elongation but is required for maintenance of meristematic activity. Boron may act as a regulator of cell division in this tissue.
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Claims 9
Claim · model-written summary
Boron withdrawal slowed squash root elongation within six hours.
Not reportedComparator
Verbatim
e0“This work establishes that cessation of root elongation of intact squash (Cucurbita pepo L.) plants is an early result of boron deficiency. Root elongation is slowed by 6 hours”
t0“Boron on Cell Elongation and Division in Squash Roots”
Claim · model-written summary
Squash root elongation virtually stopped by 24 hours after boron withdrawal.
- Taxon
- Squasht0
- Treatment
- boron is first withheld from the nutrient solutione0
- Outcome
- Root elongatione0
- Direction
- virtually stoppede0
- Value
- 24 hourse0
Not reportedComparator
Verbatim
e0“Root elongation is slowed by 6 hours and is virtually stopped as early as 24 hours after boron is first withheld from the nutrient solution”
t0“Cell Elongation and Division in Squash Roots”
Claim · model-written summary
As root elongation ceased, cell elongation progressed into the apical meristem region.
Verbatim
e0“As root elongation ceased, cell elongation progressed distally into the region normally occupied by the apical meristem”
t0“Squash Roots”
Claim · model-written summary
The meristem became indistinguishable as root elongation ceased.
Verbatim
e0“eventually the meristem became indistinguishable”
t0“Squash Roots”
Claim · model-written summary
The elongation index was 0.8 in boron-sufficient root meristems.
Verbatim
e0“This index ranged from a low of 0.8 in boron-sufficient root meristems”
t0“Squash Roots”
Claim · model-written summary
The elongation index reached 3 in boron-deficient root meristems after 98 hours.
Verbatim
e0“This index ranged from a low of 0.8 in boron-sufficient root meristems to a high of 3 in root meristems grown in a boron-deficient nutrient solution for 98 hours”
t0“Squash Roots”
Claim · model-written summary
The authors concluded that continuous boron supply is unnecessary for cell elongation.
Verbatim
e0“a continuous supply of boron is not essential for cell elongation”
t0“Squash Roots”
Claim · model-written summary
The authors concluded that boron is required to maintain meristematic activity.
Verbatim
e0“is required for maintenance of meristematic activity. Boron may act as a regulator of cell division in this tissue.”
t0“Squash Roots”
Claim · model-written summary
Boron was proposed as a possible regulator of cell division in squash roots.
Verbatim
e0“Boron may act as a regulator of cell division in this tissue.”
t0“Squash Roots”
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