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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- 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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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


