Water deficit inhibits cell division and expression of transcripts involved in cell proliferation and endoreduplication in maize endosperm

Setter, Tim L.; Flannigan, B.

doi:10.1093/jexbot/52.360.1401

Cited by 123 publications

(79 citation statements)

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“…Water deficit, temperature, nutrient supply, and light all affect endoreduplication, but the molecular mechanisms linking the environment with the endocycle machinery are still largely unknown (Artlip et al, 1995;Cavallini et al, 1995;Engelen-Eigles et al, 2001;Setter and Flannigan, 2001;Cookson et al, 2006). The best-studied case is probably the response of Arabidopsis hypocotyls to dark/light treatments, in which an extra endoreduplication cycle is triggered by darkness (Gendreau et al, 1997(Gendreau et al, , 1998.…”

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confidence: 99%

Light-Dependent Regulation ofDEL1Is Determined by the Antagonistic Action of E2Fb and E2Fc

et al. 2011

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Endoreduplication represents a variation on the cell cycle in which multiple rounds of DNA replication occur without subsequent chromosome separation and cytokinesis, thereby increasing the cellular DNA content. It is known that the DNA ploidy level of cells is controlled by external stimuli such as light; however, limited knowledge is available on how environmental signals regulate the endoreduplication cycle at the molecular level. Previously, we had demonstrated that the conversion from a mitotic cell cycle into an endoreduplication cycle is controlled by the atypical E2F transcription factor, DP-E2F-LIKE1 (DEL1), that represses the endocycle onset. Here, the Arabidopsis (Arabidopsis thaliana) DEL1 gene was identified as a transcriptional target of the classical E2Fb and E2Fc transcription factors that antagonistically control its transcript levels through competition for a single E2F cis-acting binding site. In accordance with the reported opposite effects of light on the protein levels of E2Fb and E2Fc, DEL1 transcription depended on the light regime. Strikingly, modified DEL1 expression levels uncoupled the link between light and endoreduplication in hypocotyls, implying that DEL1 acts as a regulatory connection between endocycle control and the photomorphogenic response.Plant development occurs mostly postembryonically. It involves the production of new cells that arise at the meristems from divisions of pluripotent stem cells, followed by their successive cell cycle exit and differentiation. Due to their sessile life style, plants are exposed to changing environmental conditions and thus are continuously forced to adapt their body plan (Walter et al., 2009;Skirycz and Inzé, 2010). This plasticity requires a close connection between cell division, differentiation, and development. Several studies indicate that the core cell cycle machinery is a direct target of various developmental factors (Gutierrez, 2005;Ramirez-Parra et al., 2005;Busov et al., 2008). Correspondingly, cell division rates and cell cycle gene expression levels change upon biotic and abiotic stresses (Burssens et al., 2000;Granier et al., 2000;Kadota et al., 2004;West et al., 2004). The importance of cell cycle control during plant development is further demonstrated by the aberrant plant morphologies that result from alterations in cell cycle regulation (De Veylder et al., 2001;Wyrzykowska et al., 2002;Dewitte et al., 2003Dewitte et al., , 2007.Over the last decades, the core cell cycle machinery has been well characterized. Upon cell cycle stimulation, cyclin-dependent kinases (CDKs) are activated that in turn relieve the repressive action of the RETINO-BLASTOMA-RELATED (RBR) protein on the E2F transcription factors (Inzé and De Veylder, 2006;Berckmans and De Veylder, 2009), resulting in the transcriptional activation of hundreds of E2F target genes, which are mostly DNA replication genes (Vlieghe et al., 2003;Vandepoele et al., 2005;de Jager et al., 2009;Naouar et al., 2009). The E2F/dimerization partner (DP)/RBR pathway is highly cons...

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Light-Dependent Regulation ofDEL1Is Determined by the Antagonistic Action of E2Fb and E2Fc

et al. 2011

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“…Similarly, many plant species exhibit an increase in endogenous ABA concentration in response to environment stress including salinity, water and low temperature (Setter and Ammgam, 2001). Exogenous application of proline caused a decrease in shoot Na + and Cl -accumulation and thereby enhanced growth under saline conditions in cultured barley embryos (Lone et al, 1987).…”

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confidence: 99%

Response of maize (Zea mays L.) to seed priming with NaCl and salinity stress

Bakht

Shafi²,

Jamal³

et al. 1970

Span. j. agric. res.

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Salinity is one of the biggest limitants for agriculture in semi-arid areas of the world. An experiment was conducted to study the effect of seed priming with 6 dS m–1 NaCl on growth and yield responses of two maize cultivars (Azam and Sarhad yellow) exposed to three levels of salinity (0, 6, 8 dS m–1). Statistical analysis of the data revealed that cultivars, seed priming with saline water (6 dS m–1) and subsequent exposure to salinity stress had a significant (p < 0.05) effect on germination, days to emergence, plant height, shoot fresh weight, shoot dry weight, leaf area, shoot Na+, K+, proline, abscisic acid contents and yield variables. The results suggested that increasing salinity level had a negative effect on the growth and development of both cultivars under study. Analysis of the data also revealed that maize cv Azam performed better than cv. Sarhad yellow when exposed to different levels of salinity. Priming of cv Azam with NaCl resulted in earlier emergence (2 days) and germination rate (31.92%), plant height (12%), shoot proline (950.33 μg g–1 fresh weight) and ABA levels (0.983 and 1.203 μg g–1 fresh weight) and yield (36% than the non-primed treatment). These results suggest that priming of maize seeds with NaCl before sowing induces physiological and biochemical changes, which resulted in better performance when subsequently exposed to different levels of salinity.

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“…This reduction can be due to a decrease in stomatal conductance and photosynthesis. Restriction in energy supply for development of reproductive organs anticipates physiological maturity of tassel in up to eight days in relation to ear, making fertilization impossible (Setter & Flannigan, 2001). After fertilization, low availability of hexoses for the developing grains may lead to grain abortion, and cause the production of ear with fewer rows and rows with reduced grains number, and empty grains (Bergamaschi et al, 2004;Magalhães & Durães, 2008).…”

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Drought-Tolerant Maize Genotypes Invest in Root System and Maintain High Harvest Index During Water Stress

Magalhães

Alvarenga

Lavinsky

et al. 2016

RBMS

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-Drought is considered the primary limitation to agriculture and, can reduce grain yield by up to 60% when occurs at pre-flowering in maize. In this context this research, aimed to understand the maize genotypes behavior to drought management and carbon partitioning between grain production and structures to maintain hydration when submitted to drought. Maize genotypes tolerant (DKB390 and P30F35) and sensitive (BRS1010 and 2B710) to drought were grown in a greenhouse using two water conditions: irrigated and stressed. Water deficit was imposed at pre-flowering and maintained for twelve days. Leaf water potential, gaseous exchange and male and female flowering interval were evaluated. At the end of the cycle, production components and root/shoot ratio dry weight were evaluated. Drought-tolerant genotypes used root system as a mechanism of tolerance to drought, which ensure greater efficiency in absorption and loss of water and, consequently, greater stomatal conductance during the drought, compared to the sensitive-genotypes. In addition, drought-tolerant genotypes showed greater stability in the source-sink relationship, exhibiting higher photosynthetic rate and harvest index. Keywords: water stress, carbon partitioning; root/shoot ratio dry weight, gas exchanges, Zea mays. GENÓTIPOS DE MILHO TOLERANTES À SECA INVESTEM EM SISTEMA RADICULAR E MANTEM ALTO ÍNDICE DE COLHEITA DURANTE O ESTRESSE HÍDRICORESUMO-A seca é considerada restrição primária à agricultura, e no milho, quando ocorre no pré-florescimento, pode reduzir o rendimento de grãos em até 60%. Neste contexto, objetivou-se entender como genótipos de milho contrastantes para tolerância à seca, gerenciam o particionamento de carbono entre produção de grãos e estruturas de manutenção da hidratação durante a seca. Para isso, em casa de vegetação cultivaram-se genótipos de milho tolerantes (DKB390 e P30F35) e sensíveis (BRS1010 e 2B710) à seca, em duas condições hídricas: irrigado normal e déficit hídrico. No pré-florecimento foi imposto o déficit hídrico, que foi mantido por doze dias. Posteriormente avaliou-se o potencial hídrico foliar, trocas gasosas e intervalo de florescimento masculino e feminino. No final do ciclo, avaliaram-se os componentes de produção e a razão raiz/parte aérea. Constatou-se que, genótipos tolerantes utilizaram preferencialmente sistema radicular como um mecanismo de tolerância à seca, o que garantiu a esses genótipos, maior eficiência entre a absorção e perda de água e, consequentemente, maior condutância estomática durante a seca, em relação aos genótipos sensíveis. Além disso, os genótipos tolerantes apresentaram maior equilíbrio em suas relações fonte e dreno, exibindo maiores taxa fotossintética e índice de colheita. Palavras-chave: estresse hídrico, particionamento de carbono, razão raiz/parte aérea, trocas gasosas, Zea mays. Sorgo, v.15, n.3, p. 451-461, 2016 ABSTRACT -Drought is considered the primary limitation to agriculture and, can reduce grain yield by up to 60% when occurs at pre-flowering in maize. In th...

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Water deficit inhibits cell division and expression of transcripts involved in cell proliferation and endoreduplication in maize endosperm

Cited by 123 publications

References 40 publications

Light-Dependent Regulation ofDEL1Is Determined by the Antagonistic Action of E2Fb and E2Fc

Light-Dependent Regulation ofDEL1Is Determined by the Antagonistic Action of E2Fb and E2Fc

Response of maize (Zea mays L.) to seed priming with NaCl and salinity stress

Drought-Tolerant Maize Genotypes Invest in Root System and Maintain High Harvest Index During Water Stress

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