Ethylene inhibitors improve dry matter partitioning and development of late flowering spikelets on rice panicles

Mohapatra, Pravat K.; Naik, Pradeep Kumar; Patel, Rajesh

doi:10.1071/pp99057

Cited by 40 publications

(33 citation statements)

References 32 publications

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“…There are instances other than rice, where ethylene action was reported antagonistic to that of cytokinin (Kudryakova et al 2001) because production of the former in plant tissue promotes inactivation of the latter (Tarverner et al 1999). In rice, ethylene impedes dry matter partitioning Mohapatra et al 2000) and seed coat development (Mohapatra and Mohapatra 2006) more in the basal spikelet than in the apical spikelet, resulting in poor filling of grains (Mohapatra et al 1993). Thereby, the apical spikelets exert dominance in rates of growth and cell division in the endosperm over the basal spikelets (Yang et al 2006).The dominance of the top spikelets in accumulation of dry matter or cell number, an opposing trend in ethylene formation (Table 3) indicate that auxin could also be involved in the difference of grain filling between spikelets.…”

Section: Discussionmentioning

confidence: 95%

High ethylene production slackens seed filling in compact panicled rice cultivar

et al. 2009

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Change of plant type in rice resulting in increased compactness of the panicle, allows space for accommodation of a larger number of spikelets, but grain yield does not increase proportionately because of limitations in grain filling. The objective of this study was to evaluate potential causes of poor filling of spikelets by comparing the physiological processes that influence source and sink activities between a compact-(OR-1920-7) and a loose-panicled (Lalat) rice cultivars growing in the open field conditions in the farm of Regional Research and Technology Transfer Station, Orissa University of Agriculture and Technology, Chiplima, India during dry season of 2007. Although grain number per unit length of the branches was higher in the compact-panicled cultivar than the loose-panicled cultivar, average grain weight was lower on the primary and secondary branches at top, middle and basal positions of the panicle in the former compared to the corresponding positions of the panicle in the latter. Compared to Lalat, ethylene production rate was considerably higher in the boot of the flag leaf sheath of OR-1920-7 during the pre-anthesis period. Ethylene evolution rate correlated negatively with growth and cell division rates and starch concentration of the juvenile endosperm. Because spikelet growth was slower in OR-1920-7 than in Lalat, unused carbohydrates accumulated in the endosperm. The stomatal conductance of the flag leaf during this period was also lower in the former than that of the latter and it correlated negatively with ethylene evolution rate of the boot. It is concluded that high ethylene production slackened grain filling of compact-panicled rice cultivar OR-1920-7 because of its adverse influence on both source and sink activities.

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Section: Discussionmentioning

confidence: 95%

High ethylene production slackens seed filling in compact panicled rice cultivar

et al. 2009

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“…There are reports that high levels of ethylene and 1-aminocylopropane-1-carboxylic acid (ACC), a precursor of ethylene, have frequently been related to abortion in maize (Zea Mays) (Cheng and Lur 1996) and reduction in grain weight of wheat (Triticum aestivum) (Beltrano et al 1994;Yang et al 2006a) and rice (Yang et al 2006b). Application of ethylene inhibitors improved dry matter partitioning and development of laterflowered spikelets on rice panicles (Mohapatra et al 2000). In contrast to ethylene, high levels of free PAs, spermidine (Spd, 3-amine), and spermine (Spm, 4-amine), but not putrescine (Put, diamine), are observed to be closely associated with higher kernel set and better seed development in maize (Sen et al 1981;Lin et al 1984;Feng et al 2011) and a greater grain filling rate in rice (Yang et al 2008).…”

Section: Introductionmentioning

confidence: 97%

Polyamine and ethylene interactions in grain filling of superior and inferior spikelets of rice

Wang

Jing-chao

et al. 2011

Plant Growth Regul

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This study was to test the hypothesis that polyamines (PAs) and ethylene and their interactions may be involved in mediating the post-anthesis development of spikelets in rice (Oryza sativa L.). Six rice cultivars differing in grain filling rate were field-grown, and the changing patterns of PAs and ethylene levels in rice spikelets during the filling and their relations with grain filling rates were investigated. The results showed that inferior spikelets had much greater ethylene evolution rate and 1-aminocylopropane-1-carboxylic acid (ACC) concentration than superior spikelets. Opposite to ethylene production, superior spikelets showed much higher freespermidine (Spd) and free-spermine (Spm) concentrations than inferior spikelets. Grain filling rate was very significantly and negatively correlated with ethylene evolution rate and ACC concentration, whereas positively correlated with free-Spd and free-Spm concentrations and with the ratio of free-Spd or free-Spm to ACC. Application of Spd, Spm, or aminoethoxyvinylglycine (an inhibitor of ethylene synthesis by inhibiting ACC synthesis) to panicles at the early grain filling stage significantly reduced ethylene evolution rate and ACC concentration, while significantly increased Spd and Spm concentrations, grain filling rate and grain weight of inferior spikelets. Application of ACC, ethephon (an ethylene-releasing agent), or methylglyoxal-bis (guanylhydrazone) (an inhibitor of Spd and Spm synthesis) showed the opposite effects. The results suggest that antagonistic interactions between PAs (Spd and Spm) and ethylene may be involved in mediating grain filling. A higher ratio of free-Spd or free-Spm to ethylene in rice spikelets could enhance grain filling.

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“…In support of these observations, reductions in grain filling rate and weight due to increases in ethylene under conditions of water stress have been reported in wheat [70] and rice [34], while [71] and Naik and Mohapatra (2000) [72] observed that application of ethylene inhibitors on rice improved grain filling and enhanced sucrose synthase activity under conditions of water stress. In accordance to the above reports, in our study application of 1-MCP had a pronounced effect on pistil sucrose concentration, signifi-cantly inhibiting sucrose accumulation under water-stress compared to the untreated water-stressed plants.…”

Section: Discussionmentioning

confidence: 50%

Effect of 1-MCP on Gas Exchange and Carbohydrate Concentrations of the Cotton Flower and Subtending Leaf under Water-Deficit Stress

Loka

Oosterhuis²

2013

AJPS

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Ethylene is an endogenous plant hormone that increases under adverse environmental conditions, resulting in leaf and fruit abscission and ultimately yield reduction. In cotton, however, the effects of water-deficit stress on ethylene production have been uncertain. In this study it was hypothesized that application of an ethylene inhibitor 1-Methylcyclopropene (1-MCP) would prevent ethylene production and result in alleviation of water-deficit stress consequences on the physiology and metabolism of the cotton flower and subtending leaf. To test this hypothesis, growth chamber experiments were conducted in 2009-2010 with treatments consisting of (C) untreated well-watered control, (C + 1MCP) well-watered plus 1-MCP, (WS) untreated water-stressed control, and (WS + 1MCP) water-stressed plus 1-MCP. The plants were subjected to two consecutive drying cycles during flowering, approximately 8 weeks after planting, and 1-MCP was foliar applied at a rate of 10 g. ai/ha at the beginning of each drying cycle. The results showed that 1-MCP application had no significant effect on gas exchange functions and did not prevent reductions from water stress in leaf photosynthesis, respiration and stomatal conductance. However, application of 1-MCP resulted in a decrease in sucrose content of water-stressed pistils compared to the control indicating that 1-MCP has the potential to interfere in carbohydrate metabolism of reproductive units.

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Ethylene inhibitors improve dry matter partitioning and development of late flowering spikelets on rice panicles

Cited by 40 publications

References 32 publications

High ethylene production slackens seed filling in compact panicled rice cultivar

High ethylene production slackens seed filling in compact panicled rice cultivar

Polyamine and ethylene interactions in grain filling of superior and inferior spikelets of rice

Effect of 1-MCP on Gas Exchange and Carbohydrate Concentrations of the Cotton Flower and Subtending Leaf under Water-Deficit Stress

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