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Published on November 6, 2003; 10.1104/pp.103.029579

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Received July 2, 2003
Returned for revision August 4, 2003
Accepted September 9, 2003

Increased Phytochrome B Alleviates Density Effects on Tuber Yield of Field Potato Crops

Hernán E. Boccalandro , Edmundo L. Ploschuk , Marcelo J. Yanovsky , Rodolfo A. Sánchez , Christiane Gatz , and Jorge J. Casal *

IFEVA, Faculty of Agronomy, University of Buenos Aires, Avenida San Martín 4453, 1417 Buenos Aires, Argentina (H.E.B., E.L.P., M.J.Y., R.A.S., J.J.C.); and Albrecht-v.-Haller Institute für Pflanzenwissenschaften Allgemeine und Entwicklungsphysiologie der Pflanze, Untere Karspüle 2, D-37073 Göttingen, Germany (C.G.)

* Corresponding author; email: casal{at}ifeva.edu.ar.

The possibility that reduced photomorphogenic responses could increase field crop yield has been suggested often, but experimental support is still lacking. Here, we report that ectopic expression of the Arabidopsis PHYB (phytochrome B) gene, a photoreceptor involved in detecting red to far-red light ratio associated with plant density, can increase tuber yield in field-grown transgenic potato (Solanum tuberosum) crops. Surprisingly, this effect was larger at very high densities, despite the intense reduction in the red to far-red light ratios and the concomitant narrowed differences in active phytochrome B levels between wild type and transgenics at these densities. Increased PHYB expression not only altered the ability of plants to respond to light signals, but they also modified the light environment itself. This combination resulted in larger effects of enhanced PHYB expression on tuber number and crop photosynthesis at high planting densities. The PHYB transgenics showed higher maximum photosynthesis in leaves of all strata of the canopy, and this effect was largely due to increased leaf stomatal conductance. We propose that enhanced PHYB expression could be used in breeding programs to shift optimum planting densities to higher levels.




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