The shade‐avoidance syndrome: multiple signals and ecological consequences

Plant, Cell and Environment - Tập 40 Số 11 - Trang 2530-2543 - 2017
Carlos L. Ballaré1,2, Ronald Pierik3
1IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas Universidad de Buenos Aires Ave. San Martín 4453 C1417DSE Buenos Aires Argentina
2IIB‐INTECH, Consejo Nacional de Investigaciones Científicas y Técnicas Universidad Nacional de San Martín B1650HMP Buenos Aires Argentina
3Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands

Tóm tắt

AbstractPlants use photoreceptor proteins to detect the proximity of other plants and to activate adaptive responses. Of these photoreceptors, phytochrome B (phyB), which is sensitive to changes in the red (R) to far‐red (FR) ratio of sunlight, is the one that has been studied in greatest detail. The molecular connections between the proximity signal (low R:FR) and a model physiological response (increased elongation growth) have now been mapped in considerable detail in Arabidopsis seedlings. We briefly review our current understanding of these connections and discuss recent progress in establishing the roles of other photoreceptors in regulating growth‐related pathways in response to competition cues. We also consider processes other than elongation that are controlled by photoreceptors and contribute to plant fitness under variable light conditions, including photoresponses that optimize the utilization of soil resources. In examining recent advances in the field, we highlight emerging roles of phyB as a major modulator of hormones related to plant immunity, in particular salicylic acid and jasmonic acid (JA). Recent attempts to manipulate connections between light signals and defence in Arabidopsis suggest that it might be possible to improve crop health at high planting densities by targeting links between phyB and JA signalling.

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Plant, Cell and Environment

Tập 40 Số 11

2530-2543

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