Thermomorphogenic Responses in Stem and Leaf Development

Erwin, John E.; Heins, Royal D.

doi:10.21273/hortsci.30.5.940

Cited by 75 publications

(46 citation statements)

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“…4; Erwin and Heins, 1995; Grindal, 1997; Vaagen et al , 2003). The negative DIF treatment reduced chlorophyll content in both genotypes and in all leaves of the pea plants.…”

Section: Discussionmentioning

confidence: 99%

Thermoperiodic growth control by gibberellin does not involve changes in photosynthetic or respiratory capacities in pea

Stavang

Pettersen

Wendell

et al. 2009

Journal of Experimental Botany

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Active gibberellin (GA1) is an important mediator of thermoperiodic growth in pea. Plants grown under lower day than night temperature (negative DIF) elongate less and have reduced levels of GA1 compared with plants grown at higher day than night temperature (positive DIF). By comparing the wild type (WT) and the elongated DELLA mutant la crys, this study has examined the effect of impaired GA signalling on thermoperiodic growth, photosynthesis, and respiration in pea. In the WT a negative DIF treatment reduced stem mass ratio and increased both root mass ratio and leaf mass ratio (dry weight of specific tissue related to total plant dry weight). Leaf, root and stem mass ratios of la crys were not affected by DIF. Under negative DIF, specific leaf area (projected leaf area per unit leaf dry mass), biomass, and chlorophyll content of WT and la crys plants were reduced. Young, expanding leaves of plants grown under negative DIF had reduced leaf area-based photosynthetic capacity. However, the highest photosynthetic electron transport rate was found in fully expanded leaves of WT plants grown under negative DIF. Negative DIF increased night respiration and was similar for both genotypes. It is concluded that GA signalling is not a major determinant of leaf area-based photosynthesis or respiration and that reduced dry weight of plants grown under negative DIF is caused by a GA-mediated reduction of photosynthetic stem and leaf tissue, reduced photosynthesis of young, expanding leaves, and reduced growth caused by low temperature in the photoperiod.

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“…4; Erwin and Heins, 1995; Grindal, 1997; Vaagen et al , 2003). The negative DIF treatment reduced chlorophyll content in both genotypes and in all leaves of the pea plants.…”

Section: Discussionmentioning

confidence: 99%

Thermoperiodic growth control by gibberellin does not involve changes in photosynthetic or respiratory capacities in pea

Stavang

Pettersen

Wendell

et al. 2009

Journal of Experimental Botany

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“…Plant growth is reduced under abnormal thermoperiodic conditions, i.e. lower temperatures during the light period than during the dark, a condition known as negative DIF (difference between day temperature and night temperature) that is exploited for control of plant stature [200]. Stavang et al [201] showed that stems of pea plants grown in negative DIF contained lower concentrations of C 19 -GAs and increased expression of PsGA2ox2 compared with plants grown in positive DIF and suggested that this gene was a major target for this response.…”

Section: Figure 5 Regulation Of Seed Germination In Arabidopsis By Rementioning

confidence: 99%

Gibberellin biosynthesis and its regulation

Hedden

Thomas

2012

Biochemical Journal

725

573

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The GAs (gibberellins) comprise a large group of diterpenoid carboxylic acids that are ubiquitous in higher plants, in which certain members function as endogenous growth regulators, promoting organ expansion and developmental changes. These compounds are also produced by some species of lower plants, fungi and bacteria, although, in contrast to higher plants, the function of GAs in these organisms has only recently been investigated and is still unclear. In higher plants, GAs are synthesized by the action of terpene cyclases, cytochrome P450 mono-oxygenases and 2-oxoglutarate-dependent dioxygenases localized, respectively, in plastids, the endomembrane system and the cytosol. The concentration of biologically active GAs at their sites of action is tightly regulated and is moderated by numerous developmental and environmental cues. Recent research has focused on regulatory mechanisms, acting primarily on expression of the genes that encode the dioxygenases involved in biosynthesis and deactivation. The present review discusses the current state of knowledge on GA metabolism with particular emphasis on regulation, including the complex mechanisms for the maintenance of GA homoeostasis.

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“…For this reason, other environmentally-friendly and low-cost alternatives should be explored. Increasing experimental evidence shows that more precise physiological knowledge of how environmental variables such as temperature and light modulate phenology and plant growth is a pre-requisite for designing cultivation practices to produce high quality plants (Erwin and Heins, 1995;Casal et al, 2004).…”

mentioning

confidence: 99%

Photoperiod, light, and temperature requirements to control plant architecture and flowering time inSalvia exserta

Mata¹,

Botto

2011

The Journal of Horticultural Science and Biotechnology

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Thermomorphogenic Responses in Stem and Leaf Development

Abstract: correlated with the difference between DT and NT (DIF) rather than the actual DT/NT under which plants are grown when temperatures range from 10 to 26C (Erwin, 1991; Erwin et al., 1989b; Moe and Heins, 1990; Moe et al.,

Cited by 75 publications

References 48 publications

Thermoperiodic growth control by gibberellin does not involve changes in photosynthetic or respiratory capacities in pea

Thermoperiodic growth control by gibberellin does not involve changes in photosynthetic or respiratory capacities in pea

Gibberellin biosynthesis and its regulation

Photoperiod, light, and temperature requirements to control plant architecture and flowering time inSalvia exserta

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