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Shoot growth, root growth and resource capture under limiting water and N supply for two cultivars of lettuce (Lactuca sativa L.)

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Abstract

Background and aims

To improve vegetable crops adapted to low input and variable resource availability, better understanding is needed of root system functioning, including nitrogen and water capture.

Methods

This study quantified shoot and root development and patterns of water and nitrate capture of two lettuce cultivars subjected to temporary drought at two development stages (Trial 1) or to continuous, localized drought and/or nitrate shortage (Trial 2).

Results

In Trial 1, early drought slowed down shoot and root growth, whereas late drought enhanced root proliferation in the top 0.1 m. Nitrate capture during drought was sustained by increased nitrate inflow from deeper layers. Plants did not recover fully from drought after re-watering. In Trial 2, root proliferation was stimulated in the drier soil compartment partially compensating reduced water availability and nitrate mobility. Under nitrate shortage, root proliferation was enhanced in the compartment where nitrate was more abundant, irrespective of water availability.

Conclusions

Changes observed in the root system are ‘feed-forward’ mechanisms to sustain resource capture in a limiting growing environment. The type of stress (drought or nitrate shortage) affects coping strategies; nitrate concentration in the soil solution, combined with the nutritional status of the plant will determine the stress response.

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Abbreviations

DST:

Drought Stress applied in the Top compartment

DST + NSB:

Drought Stress applied in the Top compartment combined with Nutrient Stress applied in the Bottom compartment

DW:

Dry Weight (g)

ED:

Early Drought

FW:

Fresh Weight (g)

L:

Litre

LD:

Late Drought

NST:

Nutrient Stress applied in the Top compartment

NST + DSB:

Nutrient Stress applied in the Top compartment combined with Drought Stress applied in the Bottom compartment

NUE:

Nitrogen Use Efficiency (g DM g−1 N per plant)

QTL:

Quantitative Trait Loci

SLA:

Specific Leaf Area (m2 g−1)

LA:

Total Leaf Area (m2 per plant)

TLN:

Total Leaf Number per plant

TRL:

Total Root Length per plant

WUE:

Water Use Efficiency (g DM L−1 water)

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Acknowledgments

The authors thank Martin Koper, Enza Zaden BV, and Jan Velema, Marcel van Diemen and Pieter Schwegman, Vitalis BV, for providing seeds, advice and insight. The project was financially supported through the Top Institute Green Genetics.

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Correspondence to P. J. Kerbiriou.

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Responsible Editor: Philip John White.

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Kerbiriou, P.J., Stomph, T.J., Van Der Putten, P.E.L. et al. Shoot growth, root growth and resource capture under limiting water and N supply for two cultivars of lettuce (Lactuca sativa L.). Plant Soil 371, 281–297 (2013). https://doi.org/10.1007/s11104-013-1672-6

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  • DOI: https://doi.org/10.1007/s11104-013-1672-6

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