Root System Regulation of Whole Plant Growth

Aiken, Robert M.; Smucker, A. J. M.

doi:10.1146/annurev.phyto.34.1.325

Cited by 144 publications

(73 citation statements)

References 68 publications

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“…& E.H. Wilson seedlings were increased by elevated temperature (Ormrod et al 1999;Yin et al 2008). Another study pointed out that roots would synthesize and export more cytokinin to foliage to promote pigment synthesis under more favourable temperatures (Aiken and Smucker 1996). Our results confirm that enhanced photosynthetic pigment content is closely related to the elevated temperature, which suggested our temperature increment might provide near-optimal conditions for pigment biosynthesis.…”

Section: Effects Of Warming and Nitrogen Fertilization On Photosynthesupporting

confidence: 77%

Growth and photosynthetic responses of two coniferous species to experimental warming and nitrogen fertilization

Zhao

Liu

2009

Can. J. For. Res.

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Abstract:The paper studied the short-term effects of experimental warming, nitrogen fertilization, and their combination on growth and photosynthetic performances of Picea asperata Mast. and Pinus tabulaeformis Carr. seedlings. These seedlings were subjected to two levels of temperature (ambient temperature and infrared heater warming) and two nitrogen levels (0 and 25 g NÁm -2 Áyear -1 ) for 6 months. Warming alone and fertilization alone significantly increased biomass accumulation and photosynthetic performances of both two species. The combination of warming and fertilization stimulated greater accumulation of stem, root, and total biomass and further increased chlorophyll content and net photosynthesis rate (A) in Pinus tabulaeformis seedlings. However, for Picea asperata seedlings, the interaction induced less increment in plant height, total biomass, chlorophyll contents, A, and the efficiency of photosystem than nitrogen treatment alone. These results implied that both climate warming and nitrogen addition were favorable for the early growth of both coniferous species; the interaction of these two factors caused adding or multiplying single-factor effects in the case of Pinus tabulaeformis seedlings but dampening them in the case of Picea asperata seedlings, at least in short time. Áan -1 ) pendant 6 mois. Le réchauffe-ment ou la fertilisation ont chacun significativement augmenté l'accumulation de biomasse et les performances photosynthétiques chez les deux espèces. Combinés, le réchauffement et la fertilisation ont provoqué une plus grande accumulation de la biomasse de la tige, des racines et totale et ont augmenté encore plus le contenu en chlorophylle et le taux net de photosynthèse (A) chez les semis de Pinus tabulaeformis. Cependant, chez les semis de Picea asperata, la combinaison des deux traitements a produit une moins grande augmentation de la hauteur des plants, de la biomasse totale, du contenu en chlorophylle, du taux net de photosynthèse (A) et de l'efficacité du PSII que la fertilisation azotée seule. Ces résultats impliquent que le réchauffement du climat et l'apport d'azote ont été bénéfiques pour la croissance initiale des deux espè-ces de conifère. L'interaction de ces deux facteurs a causé une addition ou une multiplication des effets de facteurs uniques dans le cas des semis de Pinus tabulaeformis mais une atténuation dans le cas des semis de Picea asperata, du moins à court terme.[Traduit par la Rédaction]

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Section: Effects Of Warming and Nitrogen Fertilization On Photosynthesupporting

confidence: 77%

Growth and photosynthetic responses of two coniferous species to experimental warming and nitrogen fertilization

Zhao

Liu

2009

Can. J. For. Res.

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“…The effects of warming and light regimes on physiological performance Aiken and Smucker (1996) suggested that roots would synthesize and export more cytokinin to foliage to promote pigment synthesis under more favorable temperature conditions. In this study, an increase in Chl a, Chl b, Chl (a + b), and carotenoid concentration for the two conifers in response to warming was observed (Fig.…”

Section: Photosynthetic Parameters Treatmentmentioning

confidence: 99%

Warming effects on growth and physiology in the seedlings of the two conifers Picea asperata and Abies faxoniana under two contrasting light conditions

Yin

Liu

Lai

2007

Ecological Research

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The short-term effects of two levels of air temperature (ambient and warmed) and light (full light and ca. 10% of full light regimes) on the early growth and physiology of Picea asperata and Abies faxoniana seedlings was determined using open-top chambers (OTC). The OTC manipulation increased mean air temperature and soil surface temperature by 0.51°C and 0.34°C under the 60-year plantation, and 0.69°C and 0.41°C under the forest opening, respectively. Warming, with either full-light or low-light conditions, generally caused a significant increase in plant growth, biomass accumulation, and stimulated photosynthetic performance of P. asperata seedlings. However, the warming of A. faxoniana seedlings only significantly increased their growth under low-light conditions, possibly as a result of photoinhibition caused by full light, which may shield and/or impair the effects of warming manipulation, per se, on the growth and physiological performance of A. faxoniana seedlings. In response to warming, P. asperata seedlings allocated relatively more biomass to roots and A. faxoniana more to foliage under similar environments. This might provide A. faxoniana with an adaptive advantage when soil moisture was not limiting and an advantage to P. asperata if substantial moisture stress occurred. Warming markedly increased the efficiency of PSII in terms of the increase in F v /F m and photosynthetic pigment concentrations for the two conifer seedlings, but the effects of warming were generally more pronounced under low-light conditions than under full-light conditions. On balance, this study suggested that warming had a beneficial impact on the early growth and development of conifer seedlings, at least in the short term. Consequently, warming may lead to changes in forest regeneration dynamics and species composition for subalpine coniferous ecosystems under future climate change.

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“…Addition of inorganic nutrients to the root growing medium of plants subjected to drought stress causes protection of different cellular organelles (Aiken, 1996). Silicon is among the known inorganic nutrients that really may play a role in some physiological processes in plants subjected to drought stress (Habibi and Hajiboland, 2013).…”

Section: Introductionmentioning

confidence: 99%

Influence of foliar application of silicon on chlorophyll fluorescence, photosynthetic pigments, and growth in water-stressed wheat cultivars differing in drought tolerance

Maghsoudi¹,

Emam²,

Ashraf³

2015

Turk J Bot

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The influence of foliar application of silicon (Si) on chlorophyll contents, chlorophyll fluorescence, and growth of four wheat cultivars differing in drought tolerance (Sirvan and Chamran, as relatively drought tolerant, and Shiraz and Marvdasht, as drought sensitive) was examined under water deficit (100% and 40% F.C.) created in a greenhouse. The results showed that water deficit decreased shoot and root lengths, shoot dry weight, root dry weight, water utilization efficiency, chlorophyll a and b, and chlorophyll stability index. In contrast, foliar application of Si improved plant growth parameters and chlorophyll pigment concentration under water deficit; however, it did not significantly affect wheat growth under control conditions. Limited water supply reduced the values of minimal fluorescence from dark-adapted leaf (F 0 ), maximal fluorescence from dark-adapted leaf (F m ), maximum quantum yield of PSII (F v /F m ), effective quantum yield of PSII (ΦPSII), photochemical quenching (q P ), and apparent photosynthetic electron transport rate (ETR). However, under water deficit, foliar application of Si application increased the earlier mentioned parameters. In contrast, nonphotochemical quenching (q N ) and F 0 /F m increased under water deficit, and application of Si further improved these parameters. Chlorophyll fluorescence analysis suggested that Si alleviated water deficit-induced adverse effects by reducing nonphotochemical quenching, while increasing F v /F m and q P , so that it improved the light use efficiency in the four wheat cultivars under stress. Overall, we concluded that drought-sensitive cultivars (Shiraz and Marvdasht) could resemble resistant cultivars upon foliar application of silicon.

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Root System Regulation of Whole Plant Growth

Cited by 144 publications

References 68 publications

Growth and photosynthetic responses of two coniferous species to experimental warming and nitrogen fertilization

Growth and photosynthetic responses of two coniferous species to experimental warming and nitrogen fertilization

Warming effects on growth and physiology in the seedlings of the two conifers Picea asperata and Abies faxoniana under two contrasting light conditions

Influence of foliar application of silicon on chlorophyll fluorescence, photosynthetic pigments, and growth in water-stressed wheat cultivars differing in drought tolerance

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