Gross Respiratory and Water Uptake Patterns in Germinating Sugar Pine Seed

Water uptake patterns of wheat plants were studied in a growth chamber by using two soils packed to three different bulk densities. The resistances to water movement in the soil and in the plant were calculated from the mathematical model for water uptake published in the literature. When the capillary potential of the soils was near −⅓ bar, withdrawal of water by plants was relatively small and most of the water was taken from the top 25 cm of the soil column. As soil water potential decreased, water uptake increased progressively toward the lower part of the soil column. The resistance to water movement in the plant increased from the top to the bottom of the root system and increased with increasing bulk density of the soils. For wet soils, unrealistic values were obtained which could be due to the fact that the interaction between aeration and moisture uptake is not taken into account in the theoretical equations for moisture uptake.

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PATTERNS OF WATER UPTAKE AND ROOT DISTRIBUTION OF CHILLI PEPPERS GROWN IN SOIL COLUMNS

Canadian Journal of Plant Science ◽

10.4141/cjps87-075 ◽

1987 ◽

Vol 67 (2) ◽

pp. 531-535 ◽

Cited By ~ 7

Author(s):

N. R. HULUGALLE ◽

S. T. WILLATT

Keyword(s):

Soil Moisture ◽

Root Growth ◽

Water Uptake ◽

Water Availability ◽

Soil Profile ◽

Root Distribution ◽

Soil Columns ◽

Chilli Pepper ◽

Pepper Plants ◽

Water Uptake Patterns

Root distribution and water uptake patterns of individual chilli pepper (Capsicum annuum L. ’Long Slim Cayenne’) plants growth in 1-m-high soil columns in plastic cylinders were examined under irrigated and nonirrigated conditions. Roots were able to grow through the soil profile and consequently extract water from a soil which was conducive to root growth. Water uptake occurred both in the irrigated and in the nonirrigated treatment throughout the soil profile. Uptake was highest in the top 0.50 m of the former and was a result of greater water availability rather than lack of root growth at greater depths. Chilli pepper plants can, under droughty conditions, extract subsoil moisture.Key words: Chilli pepper, soil moisture, water uptake, root growth

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Stay-green alleles individually enhance grain yield in sorghum under drought by modifying canopy development and water uptake patterns

New Phytologist ◽

10.1111/nph.12869 ◽

2014 ◽

Vol 203 (3) ◽

pp. 817-830 ◽

Cited By ~ 82

Author(s):

Andrew K. Borrell ◽

Erik J. van Oosterom ◽

John E. Mullet ◽

Barbara George-Jaeggli ◽

David R. Jordan ◽

...

Keyword(s):

Grain Yield ◽

Water Uptake ◽

Stay Green ◽

Canopy Development ◽

Water Uptake Patterns

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Patchy nitrate promotes inter-sector flow and 15N allocation in Ocimum basilicum: a model and an experiment

Functional Plant Biology ◽

10.1071/fp11141 ◽

2011 ◽

Vol 38 (11) ◽

pp. 879 ◽

Cited By ~ 3

Author(s):

Alexandra M. Thorn ◽

Colin M. Orians

Keyword(s):

Water Uptake ◽

Nitrate Solution ◽

Ocimum Basilicum ◽

Nitrogen Allocation ◽

Split Root ◽

Flow Through ◽

Root Conductance ◽

Relative Change ◽

Root Resistance ◽

Water Uptake Patterns

Root conductance increases under high nitrate conditions. This plasticity might increase water and nutrient transport between parallel xylem pathways, but restrictions to lateral flow – called sectoriality – are expected to limit this crossover. We simulated the effects of a high nitrate patch on root conductance, water uptake and inter-sector water transport, then empirically tested whether a high nitrate patch affects water uptake and nitrogen distribution (applied 15N as 14NH415NO3 to half the root system) within the crowns of split-root hydroponic basil (Ocimum basilicum L.). Simulations showed that at low sectoriality, the proportion of water taken up in a patch scales with the relative change in root resistance and that this fraction decreases with increasing tangential resistance. The effect of sectoriality decreased when a higher background root resistance was assumed. Empirically, water flow through excised basil roots was 1.4 times higher in the high nitrate than the no nitrate solution. In split-root basil, a nitrate patch resulted in a marginally significant increase in the proportion of water taken up from the patch and water uptake patterns significantly predicted the distribution of 15N. Our results suggest that root conductance can mediate nitrogen allocation between sectors, a previously unexplored benefit.

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