Effects of water shortage on six potato genotypes in the highlands of Bolivia (I): morphological parameters, growth and yield
2003
Tourneux, Christophe | Devaux, André | Camacho, Maria René | Mamani Ramírez, Pablo | Ledent, Jean-François
The objective of this paper is to characterize drought-adaptation, and to identify indicators of drought-tolerance in potato in the Andean Highlands. Six genotypes, representing a range of contrasting morphological and agronomic characters and belonging to three species, were grown in containers. The treatments were R0 (irrigated control), R1 (progressive drought after tuberisation, with a recovery period) and R2 (as R1, but no recovery irrigation). Genotypes differed in plant height, leaf area index (LAI), proportion of ground covered by green foliage and root expansion. Drought did not significantly affect stem number, and slightly decreased plant height and leaf number. It reduced leaf area index and canopy cover in all genotypes. Dry matter production was greatly affected in cultivars Ajahuiri and Luky, but very little in the other genotypes. Under drought, Alpha and CIP 382171.10 gave the highest yields and Luky the lowest. Depending on genotype and degree of yield reduction, yield losses were associated with a decrease either in radiation intercepted, the efficiency of its conversion into dry matter, or harvest index. Harvest index and root biomass correlated well with tuber yield. Other parameters, such as leaf number, plant height and canopy cover, correlated with tuber yield only in the R2 treatment.
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