Relationship between panicle differentiation and main stem leaf number in rice genotypes and red rice biotypes

Streck, Nereu Augusto; Lago, Isabel; Bosco, Leosane Cristina; Paula, Gizelli Moiano de; Oliveira, Felipe Brendler; Gabriel, Luana Fernandes; Schwantes, Ana Paula

doi:10.1590/s0103-90162009000200008

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The two weedy red rice biotypes, referred hereafter as YHRR (yellow-hull red rice) and BHRR (black-hull red rice), are representative of the major pool of red rice biotypes found in commercial rice fields in Rio Grande do Sul State and are tall, with broad and light green leaves, and high and early kernel shattering rates (Streck et al, 2009).…”

Section: Methodsmentioning

confidence: 99%

Leaf development of cultivated rice and weedy red rice under elevated temperature scenarios

Streck

Uhlmann

Gabriel

2013

Rev. bras. eng. agríc. ambient.

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The objective of this study was to simulate leaf development of cultivated rice genotypes and weedy red rice biotypes in climate change scenarios at Santa Maria, RS, Brazil. A leaf appearance (LAR) model adapted for rice was used to simulate the accumulated leaf number, represented by the Haun Stage, from crop emergence to flag leaf appearance (EM-FL). Three cultivated rice genotypes and two weedy red rice biotypes in six emergence dates were used. The LAR model was run for each emergence date using 100 years of synthetic daily weather data and six climate scenarios, including current, +1, +2, +3, +4 and +5 °C increase in mean air temperature, with symmetric and asymmetric increase in daily minimum and maximum temperature. The increase in air temperature scenarios decreased the duration of the EM-FL phase in the earlier emergence dates (08/20, 09/20, 10/20) whereas in mid (11/20) and late emergence dates (12/20 and 01/20) the longest EM-FL phase was in the symmetric +5 °C scenario and the shortest duration was in the asymmetric +3 and +4 °C scenarios. The timing of the onset of flooding irrigation and nitrogen dressing may be altered if global warming takes place and weedy red rice has a potential to enhance its competitiveness with cultivated rice in future climates.Key words: Oryza sativa, global warming, plant competition, climate change, nitrogen management Desenvolvimento foliar de arroz cultivado e arroz vermelho em cenários de aumento de temperatura RESUMO Objetivou-se com este estudo simular o desenvolvimento foliar de genótipos de arroz cultivados e biótipos invasores de arroz vermelho em cenários de mudança climática em Santa Maria, Rio Grande do Sul, Brasil. Um modelo de aparecimento de folhas foi usado para simular o número de folhas acumuladas, representadas pelo Estádio de Haun, a partir da emergência da cultura até o aparecimento da folha bandeira (EM-FB). Foram utilizados três genótipos de arroz cultivados e dois biótipos de arroz vermelho, em seis épocas de emergência. O modelo foi rodado em cem anos de seis cenários climáticos: atual, +1, +2, +3, +4 e +5 °C, com aumentos simétricos e assimétricos na temperatura mínima e máxima diária do ar. O aumento da temperatura nos cenários ocasiona uma redução da duração da fase EM-FB nas datas de emergência mais cedo (20/08, 20/09, 20/10) enquanto no período intermediário (20/11) e nas datas de emergência tardias (20/12 e 20/01) a maior duração da fase EM-FB foi no cenário simétrico +5 °C e a menor duração foi nos cenários assimétricos de +3 e +4 °C. O momento do início da irrigação por inundação e manejo do nitrogênio em cobertura pode ser alterado com o aquecimento global e o arroz vermelho tem potencial para aumentar sua competitividade com arroz cultivado em climas futuros. Palavras

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Section: Methodsmentioning

confidence: 99%

Leaf development of cultivated rice and weedy red rice under elevated temperature scenarios

Streck

Uhlmann

Gabriel

2013

Rev. bras. eng. agríc. ambient.

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“…All these processes are depending on C assimilated and N availability, as reported by Lafarge and Bueno ( 2009 ) and Dingkuhn et al ( 2015 ) in rice, and by Dreccer et al ( 2008 ) in wheat. Regarding panicle size, many studies reported that panicle development, and the determination of spikelet number per panicle, is closely correlated to early plant vigor and underlying traits such as leaf appearance rate (Dong et al, 2004 ; Streck et al, 2009 ; Itoh and Shimizu, 2012 ; Rebolledo et al, 2012 ), tillering (Lafarge et al, 2002 , 2010 ; Borràs-Gelonch et al, 2012 ), culm (Fujita and Yoshida, 1984 ; Wu et al, 2011 ), and peduncle (Liu et al, 2008 ) size, plant height (Wang et al, 2014 ; Chen et al, 2015 ), or even neck internode diameter (Zhang and Yamagishi, 2010 ).…”

Section: Introductionmentioning

confidence: 99%

The qTSN Positive Effect on Panicle and Flag Leaf Size of Rice is Associated with an Early Down-Regulation of Tillering

et al. 2016

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The qTSN4 was identified as rice QTL (Quantitative Traits Locus) increasing total spikelet number per panicle and flag leaf area but potentially reducing panicle number depending on the environment. So far, this trade-off was mainly observed at grain maturity and not specifically studied in details, limiting the apprehension of the agronomic interest of qTSN4. This study aimed to understand the effect of qTSN4 and of the environment on panicle sizing, its trade-off with panicle number, and finally plant grain production. It compared two high yielding genotypes to their Near Isogenic Lines (NIL) carrying either QTL qTSN4 or qTSN12, two distinct QTLs contributing to the enlarged panicle size, thereafter designated as qTSN. Traits describing C sink (organ appearance rate, size, biomass) and source (leaf area, photosynthesis, sugar availability) were dynamically characterized along plant and/or panicle development within two trials (greenhouse, field), each comparing two treatments contrasting for plant access to light (with or without shading, high or low planting densities). The positive effect of qTSN on panicle size and flag leaf area of the main tiller was confirmed. More precisely, it could be shown that qTSN increased leaf area and internode cross-section, and in some cases of the photosynthetic rate and starch reserves, of the top 3–4 phytomers of the main tiller. This was accompanied by an earlier tillering cessation, that coincided with the initiation of these phytomers, and an enhanced panicle size on the main tiller. Plant leaf area at flowering was not affected by qTSN but fertile tiller number was reduced to an extent that depended on the environment. Accordingly, plant grain production was enhanced by qTSN only under shading in the greenhouse experiment, where panicle number was not affected and photosynthesis and starch storage in internodes was enhanced. The effect of qTSN on rice phenotype was thus expressed before panicle initiation (PI). Whether early tillering reduction or organ oversizing at meristem level is affected first cannot be entirely unraveled. Further studies are needed to better understand any signal involved in this early regulation and the qTSN × Environment interactions underlying its agronomic interest.

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“…As análises de variância (Tabela 1) mostraram efeitos significativos da interação cultivar x data de semeadura para as variáveis NFF (Tabela 2 (STRECK et al, 2006;STRECK et al, 2009;WALTER et al, 2009).…”

Section: Resultsunclassified

Número de folhas associado com duplo anel e espigueta terminal em cultivares de trigo

et al. 2012

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RESUMO -O objetivo deste trabalho foi determinar o número de folhas, representado pelo Estágio de Haun, no duplo anel e na espigueta terminal de cultivares de trigo com diferentes ciclos de desenvolvimento e cultivados em diferentes datas de semeadura. Um experimento de campo foi realizado em Santa Maria, RS, com 13 datas de semeadura ao longo de três anos (2005; 2006 e 2007). Foram utilizados seis genótipos de trigo com ciclos de desenvolvimento variando de precoce a tardio: BRS Louro, CEP 52, BRS 177, CEP 51, Nova Era e BRS Tarumã. O delineamento experimental utilizado foi blocos completos casualizados, com seis tratamentos (cultivares) e quatro repetições. Foram determinados os estágios início do perfilhamento, duplo anel (DA), espigueta terminal (ET) e o número final de folhas no colmo principal (NFF) e na data em que ocorreu o DA e a ET foi quantificado o número de folhas totalmente expandidas mais a fração decimal do comprimento da lâmina foliar da última folha (em expansão) em relação à penúltima folha (expandida), com os quais foi calculado o Estágio de Haun (HS). Os resultados indicam que o número de folhas no colmo principal, representado pelo HS, no duplo anel (HS DA ) e na espigueta terminal (HS ET ) em trigo, varia com a cultivar (grupo de maturação) e com a data de semeadura. Práticas de manejo como a adubação nitrogenada e a aplicação de herbicidas hormonais podem ser melhoradas usando-se o HS DA e HS ET ao invés do início do perfilhamento e elongação do colmo, respectivamente. Palavras-chave:Trigo-adubação nitrogenada. Semeadura. Herbicidas. ABSTRACT -The objective of this study was to determine the number of leaves, represented by the Haun stage, in the double ridge and terminal spikelet of wheat cultivars with different development cycles and grown on different sowing dates. A field experiment was conducted in Santa Maria, RS with 13 sowing dates over three years (2005, 2006 and 2007). Six wheat genotypes were used with development cycles ranging from early to late: BRS Louro, CEP 52, BRS 177, CEP 51, Nova Era and BRS Tarumã. The experimental design used was of randomized complete blocks, with six treatments (cultivars) and four repetitions. The early stages of tillering, double-ridging (DA), terminal spikelet (ET) and the final number of leaves on the main stem (NFF) were determined, and on the date of DA and ET, the number of fully expanded leaves was quantified together with the decimal fraction of the length of the leaf blade of the last leaf (unfolded) in relation to the penultimate leaf (unfolding), with which the Haun Stage (HS) was calculated. The results indicate that the number of leaves on the main stem, represented by HS, in the double ridge (HS DA ) and in the terminal spikelet (HS ET ) in wheat, varies with the cultivar (maturity group) and the date of sowing. Management practices such as fertilization with nitrogen and the application of hormonal herbicides can be improved by using the HS DA and HS ET, instead of the onset of tillering and stem elongation, respectively.

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Relationship between panicle differentiation and main stem leaf number in rice genotypes and red rice biotypes

Cited by 6 publications

References 15 publications

Leaf development of cultivated rice and weedy red rice under elevated temperature scenarios

Leaf development of cultivated rice and weedy red rice under elevated temperature scenarios

The qTSN Positive Effect on Panicle and Flag Leaf Size of Rice is Associated with an Early Down-Regulation of Tillering

Número de folhas associado com duplo anel e espigueta terminal em cultivares de trigo

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