Study of the senescence process in primary leaves of sunflower (Helianthus annuus L.) plants under two different light intensities

Mata, Lourdes de la; Cabello, Purificación; Haba, Purificación de la; Agüera, E.

doi:10.1007/s11099-013-0001-x

Cited by 11 publications

(6 citation statements)

References 76 publications

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“…MDA is the products of cellular membrane lipid peroxidation, revealing the damage of ROS to plant cellular membrane system. The overproduction of ROS including O2 •and MDA may result from the depression of antioxidant enzymes (Ji et al 2002, Procházková and Wilhelmová 2004, De La Mata et al 2013. In this work, the activity of antioxidant enzymes including SOD, CAT, APX, and POD in both cultivars were inhibited significantly, although the antioxidants including AsA was increased by long-term HL, which ultimately led to the accumulation of ROS under long-term HL stress.…”

Section: Discussionmentioning

confidence: 56%

“…To meet the large gap, radiation-use efficiency (RUE) is considered an important approach for wheat genetic yield improvement (Horton 2000, Richards 2000, Foulkes et al 2011, Parry et al 2011, Reynolds et al 2012. Photooxidative stress induced by HL, a determining factor for RUE improvement, is a significant constraint for realization of wheat yield potential as it downregulates CO2 assimilation rate and promotes leaf senescence (De La Mata et al 2013, Juvany et al 2013, Pintó-Marijuan and Munné-Bosch 2014. Therefore, it enables wheat genetic yield improvement via RUE improvement to understand the physiological and genetic mechanisms of tolerance to HLinduced photooxidative stress in wheat.…”

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confidence: 99%

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Long-term high light stress induces leaf senescence in wheat (Triticum aestivum L.)

Liu¹,

Xu²,

Li³

et al. 2019

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In order to explore the association of long-term high light (HL) with leaf senescence in wheat, two wheat genotypes Xiaoyan 54 (HL-tolerant) and Jing 411 (HL-sensitive) grown in low light were subjected to HL for 2-8 d. The results showed that 6-8 d of HL led to dramatic decline of chlorophyll content, photochemical efficiency, and activity of Rubisco and antioxidant enzymes. Meanwhile, the content of malondialdehyde (MDA), soluble proteins, soluble sugars, superoxide anion, and ascorbic acid increased markedly. Additionally, the expression of senescence-associated genes (SAGs) was induced by HL. Xiaoyan 54 accumulated less MDA, soluble sugars, and superoxide anions but showed a higher ratio of reduced to oxidized ascorbic acid than that in Jing 411 under long-term HL stress. Moreover, most of the assayed SAGs were less induced in Xiaoyan 54 than that in Jing 411. Altogether, the reduction of antioxidant enzyme activities and accumulation of soluble sugars may result in long-term HL-induced leaf senescence.

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Section: Discussionmentioning

confidence: 56%

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confidence: 99%

Long-term high light stress induces leaf senescence in wheat (Triticum aestivum L.)

Liu¹,

Xu²,

Li³

et al. 2019

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“…Nitrogen content represents an important leaf senescence-associated variable, given its central role in key cellular processes such as photosynthesis. Previous studies examined several physiological parameters related to leaf senescence in sunflower [9] , [35] – [37] , but the relationship of these parameters to gene expression, particularly the induction of transcription factors at an early stage of leaf development, has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Identification of Candidate Genes Associated with Leaf Senescence in Cultivated Sunflower (Helianthus annuus L.)

et al. 2014

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Cultivated sunflower (Helianthus annuus L.), an important source of edible vegetable oil, shows rapid onset of senescence, which limits production by reducing photosynthetic capacity under specific growing conditions. Carbon for grain filling depends strongly on light interception by green leaf area, which diminishes during grain filling due to leaf senescence. Transcription factors (TFs) regulate the progression of leaf senescence in plants and have been well explored in model systems, but information for many agronomic crops remains limited. Here, we characterize the expression profiles of a set of putative senescence associated genes (SAGs) identified by a candidate gene approach and sunflower microarray expression studies. We examined a time course of sunflower leaves undergoing natural senescence and used quantitative PCR (qPCR) to measure the expression of 11 candidate genes representing the NAC, WRKY, MYB and NF-Y TF families. In addition, we measured physiological parameters such as chlorophyll, total soluble sugars and nitrogen content. The expression of Ha-NAC01, Ha-NAC03, Ha-NAC04, Ha-NAC05 and Ha-MYB01 TFs increased before the remobilization rate increased and therefore, before the appearance of the first physiological symptoms of senescence, whereas Ha-NAC02 expression decreased. In addition, we also examined the trifurcate feed-forward pathway (involving ORE1, miR164, and ETHYLENE INSENSITIVE 2) previously reported for Arabidopsis. We measured transcription of Ha-NAC01 (the sunflower homolog of ORE1) and Ha-EIN2, along with the levels of miR164, in two leaves from different stem positions, and identified differences in transcription between basal and upper leaves. Interestingly, Ha-NAC01 and Ha-EIN2 transcription profiles showed an earlier up-regulation in upper leaves of plants close to maturity, compared with basal leaves of plants at pre-anthesis stages. These results suggest that the H. annuus TFs characterized in this work could play important roles as potential triggers of leaf senescence and thus can be considered putative candidate genes for senescence in sunflower.

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“…The role of sugars as key regulators of leaf senescence has been the subject of much study (Wingler and Roitsch 2008). Nitrogen deficiency and growth at high irradiance levels can result in sugar accumulation that induces leaf senescence through hexose-dependent signaling (Agu¨era et al 2010;De la Mata et al 2013). Although soluble sugars have been frequently associated to the onset of leaf senescence, their role remains controversial (van Doorn 2008).…”

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High temperature promotes early senescence in primary leaves of sunflower (Helianthus annuus L.) plants

et al. 2014

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De la Haba, P., De la Mata, L., Molina, E. and Agu¨era, E. 2014. High temperature promotes early senescence in primary leaves of sunflower (Helianthus annuus L.) plants. Can. J. Plant Sci. 94: 659Á669. High temperature affects numerous biochemical and physiological traits in plants. Primary leaves of sunflower (Helianthus annuus L.) were collected from plants grown under a control temperature (day/night regime of 23/198C) or a high temperature (day/night regime of 33/ 298C) for 16, 22, 28, 32 or 42 d. Leaves of sunflower plants exposed to high temperature exhibited decreased growth, as reflected by lower specific leaf mass and reduced leaf area as compared with controls. A superior decrease in soluble protein content during leaf life span in plants grown at high temperature relative to control plants (70% vs. 45%, respectively) suggests that high temperature promotes soluble protein degradation in leaves. High temperature also reduces net photosynthetic rate (P N ) possibly by decreasing the content in photosynthetic pigments and the stomatal conductance (g s ). The activity of nitrate reductase and glutamine synthetase decreased while deaminating activity in glutamate dehydrogenase increased in leaves exposed to high temperature. Our results suggest that high temperature induced early senescence in sunflower leaves, probably as a result of an accumulation of soluble sugars and the associated decrease in starch levels. Oxidative damage resulting from increased H 2 O 2 accumulation and a decline in antioxidant activity may have also contributed to accelerated senescence of primary leaves at high temperature. De la Haba, P., De la Mata, L., Molina, E. et Agu¨era, E. 2014. High temperature promotes early senescence in primary leaves of sunflower (Helianthus annuus L.) plants. Can. J. Plant Sci. 94: 659Á669. Les tempe´ratures e´leve´es affectent plusieurs processus biochimiques et physiologiques chez les plantes. Les premie`res feuilles ont e´te´preleve´es de plants de tournesol (Helianthus annuus L.) cultive´s a`une tempe´rature te´moin (re´gime jour/ nuit de 23/19 8C) et de plants cultive´s aù ne tempe´rature e´leve´e (re´gime jour/nuit de 33/29 8C) 16, 22, 28, 32 et 42 jours apre`s l'e´mergence. Les plants de tournesol cultive´s a`une tempe´rature e´leve´e ont montre´une croissance re´duite qui s'est traduite par une masse foliaire spe´cifique (SLM) et une surface foliaire infe´rieures comparativement aux plantes te´moins.Une diminution plus marque´e au cours de la pe´riode d'e´chantillonnage du contenu en prote´ines solubles chez les plantes cultive´s à tempe´rature e´leve´e comparativement aux plantes te´moins (70% et 45% respectivement) sugge`re que les tempe´ratures e´leve´es favorisent la de´gradation des prote´ines foliaires. L'exposition a`une tempe´rature e´leve´e a e´galement re´duit le taux de photosynthe`se nette (P N ), probablement a`cause de la diminution du contenu des pigments photosynthe´tiques et de la conductance stomatique (g s ). Au cours du de´veloppment foliaire, la tempe´rature e´leve´e a d...

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Study of the senescence process in primary leaves of sunflower (Helianthus annuus L.) plants under two different light intensities

Cited by 11 publications

References 76 publications

Long-term high light stress induces leaf senescence in wheat (Triticum aestivum L.)

Long-term high light stress induces leaf senescence in wheat (Triticum aestivum L.)

Identification of Candidate Genes Associated with Leaf Senescence in Cultivated Sunflower (Helianthus annuus L.)

High temperature promotes early senescence in primary leaves of sunflower (Helianthus annuus L.) plants

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