Root growth, developmental changes in the apex, and hydraulic conductivity for Opuntia ficus-indica during drought

Iossif Doubrovski Jankovsky, Gretchen B. North, Park S. Nobel

Resultado de la investigación: Contribución a una revistaArtículo

47 Citas (Scopus)

Resumen

Developmental changes in the root apex and accompanying changes in lateral root growth and root hydraulic conductivity were examined for Opuntia ficus-indica (L.) Miller during rapid drying, as occurs for roots near the soil surface, and more gradual drying, as occurs in deeper soil layers. During 7 d of rapid drying (in containers with a 3-cm depth of vermiculite), the rate of root growth decreased sharply and most root apices died; such a determinate pattern of root growth was not due to meristem exhaustion but rather to meristem mortality after 3 d of drying. The length of the meristem, the duration of the cell division cycle, and the length of the elongation zone were unchanged during rapid drying. During 14 d of gradual drying (in containers with a 6-cm depth of vermiculite), root mortality was relatively low; the length of the elongation zone decreased by 70%, the number of meristematic cells decreased 30%, and the duration of the cell cycle increased by 36%. Root hydraulic conductivity (L(p)) decreased to one half during both drying treatments; L(p) was restored by 2 d of rewetting owing to the emergence of lateral roots following rapid drying and to renewed apical elongation following gradual drying. Thus, in response to drought, the apical meristems of roots of O. ficus-indica near the surface die, whereas deeper in the substrate cell division and elongation in root spices continue. Water uptake in response to rainfall in the field can be enhanced by lateral root proliferation near the soil surface and additionally by resumption of apical growth for deeper roots.

Idioma originalInglés
Páginas (desde-hasta)75-82
Número de páginas8
PublicaciónNew Phytologist
Volumen138
N.º1
DOI
EstadoPublicada - 1 ene 1998

Huella dactilar

Opuntia
Opuntia ficus-indica
Meristem
Droughts
hydraulic conductivity
root growth
drying
drought
Soil
Growth
Cell Cycle
meristems
Spices
root hydraulic conductivity
Mortality
vermiculite
Cell Division
containers
cell division
Cell Count

Citar esto

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title = "Root growth, developmental changes in the apex, and hydraulic conductivity for Opuntia ficus-indica during drought",
abstract = "Developmental changes in the root apex and accompanying changes in lateral root growth and root hydraulic conductivity were examined for Opuntia ficus-indica (L.) Miller during rapid drying, as occurs for roots near the soil surface, and more gradual drying, as occurs in deeper soil layers. During 7 d of rapid drying (in containers with a 3-cm depth of vermiculite), the rate of root growth decreased sharply and most root apices died; such a determinate pattern of root growth was not due to meristem exhaustion but rather to meristem mortality after 3 d of drying. The length of the meristem, the duration of the cell division cycle, and the length of the elongation zone were unchanged during rapid drying. During 14 d of gradual drying (in containers with a 6-cm depth of vermiculite), root mortality was relatively low; the length of the elongation zone decreased by 70{\%}, the number of meristematic cells decreased 30{\%}, and the duration of the cell cycle increased by 36{\%}. Root hydraulic conductivity (L(p)) decreased to one half during both drying treatments; L(p) was restored by 2 d of rewetting owing to the emergence of lateral roots following rapid drying and to renewed apical elongation following gradual drying. Thus, in response to drought, the apical meristems of roots of O. ficus-indica near the surface die, whereas deeper in the substrate cell division and elongation in root spices continue. Water uptake in response to rainfall in the field can be enhanced by lateral root proliferation near the soil surface and additionally by resumption of apical growth for deeper roots.",
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Root growth, developmental changes in the apex, and hydraulic conductivity for Opuntia ficus-indica during drought. / Doubrovski Jankovsky, Iossif; North, Gretchen B.; Nobel, Park S.

En: New Phytologist, Vol. 138, N.º 1, 01.01.1998, p. 75-82.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - Root growth, developmental changes in the apex, and hydraulic conductivity for Opuntia ficus-indica during drought

AU - Doubrovski Jankovsky, Iossif

AU - North, Gretchen B.

AU - Nobel, Park S.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - Developmental changes in the root apex and accompanying changes in lateral root growth and root hydraulic conductivity were examined for Opuntia ficus-indica (L.) Miller during rapid drying, as occurs for roots near the soil surface, and more gradual drying, as occurs in deeper soil layers. During 7 d of rapid drying (in containers with a 3-cm depth of vermiculite), the rate of root growth decreased sharply and most root apices died; such a determinate pattern of root growth was not due to meristem exhaustion but rather to meristem mortality after 3 d of drying. The length of the meristem, the duration of the cell division cycle, and the length of the elongation zone were unchanged during rapid drying. During 14 d of gradual drying (in containers with a 6-cm depth of vermiculite), root mortality was relatively low; the length of the elongation zone decreased by 70%, the number of meristematic cells decreased 30%, and the duration of the cell cycle increased by 36%. Root hydraulic conductivity (L(p)) decreased to one half during both drying treatments; L(p) was restored by 2 d of rewetting owing to the emergence of lateral roots following rapid drying and to renewed apical elongation following gradual drying. Thus, in response to drought, the apical meristems of roots of O. ficus-indica near the surface die, whereas deeper in the substrate cell division and elongation in root spices continue. Water uptake in response to rainfall in the field can be enhanced by lateral root proliferation near the soil surface and additionally by resumption of apical growth for deeper roots.

AB - Developmental changes in the root apex and accompanying changes in lateral root growth and root hydraulic conductivity were examined for Opuntia ficus-indica (L.) Miller during rapid drying, as occurs for roots near the soil surface, and more gradual drying, as occurs in deeper soil layers. During 7 d of rapid drying (in containers with a 3-cm depth of vermiculite), the rate of root growth decreased sharply and most root apices died; such a determinate pattern of root growth was not due to meristem exhaustion but rather to meristem mortality after 3 d of drying. The length of the meristem, the duration of the cell division cycle, and the length of the elongation zone were unchanged during rapid drying. During 14 d of gradual drying (in containers with a 6-cm depth of vermiculite), root mortality was relatively low; the length of the elongation zone decreased by 70%, the number of meristematic cells decreased 30%, and the duration of the cell cycle increased by 36%. Root hydraulic conductivity (L(p)) decreased to one half during both drying treatments; L(p) was restored by 2 d of rewetting owing to the emergence of lateral roots following rapid drying and to renewed apical elongation following gradual drying. Thus, in response to drought, the apical meristems of roots of O. ficus-indica near the surface die, whereas deeper in the substrate cell division and elongation in root spices continue. Water uptake in response to rainfall in the field can be enhanced by lateral root proliferation near the soil surface and additionally by resumption of apical growth for deeper roots.

KW - Cell division

KW - Elongation zone

KW - Lateral roots

KW - Meristem

KW - Root primordia

KW - Water uptake

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U2 - 10.1046/j.1469-8137.1998.00884.x

DO - 10.1046/j.1469-8137.1998.00884.x

M3 - Artículo

AN - SCOPUS:0031833202

VL - 138

SP - 75

EP - 82

JO - New Phytologist

JF - New Phytologist

SN - 0028-646X

IS - 1

ER -