Higher Leaf Area Growth Rate Contributes to Greater Vegetative Growth of F<sub>1</sub> Rice Hybrids in the Tropics

Laza, M.; Peng, Shaobing; Sanico, Arnel L.; Visperas, R. M.; Akita, Shigemi

doi:10.1626/pps.4.184

Cited by 29 publications

(11 citation statements)

References 7 publications

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“…This is inconsistent with the results of Islam et al (2007) that there was no correlation between culm height and lodging index of lower internodes[ 14 ]. Plant height was not necessarily the most important factor in determining lodging resistance[ 40 ], but long culm length and large leaf area index of hybrid rice may cause an increase in bending moment[ 41 ], resulting in high lodging index[ 14 ]. In addition, DWUL was negative correlated with LI significantly ( Table 4 ) despite NDW and DWUL was not enhanced with year of release.…”

Section: Discussionmentioning

confidence: 99%

Changes in the Lodging-Related Traits along with Rice Genetic Improvement in China

Zhu

Wang

et al. 2016

PLoS ONE

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Rice yield potential was greatly improved since the green revolution, but the occurrence of lodging often restricts the achievement of potential yield. Currently, it is still obscure about how the lodging-related traits change along with the genetic improvement in yield potential of rice, although much efforts have been devoted to study the trend of and physiological mechanisms underlying changes in grain yield. Therefore, fourteen rice mega-varieties that were released and disseminated from 1930s to 2005 in China were investigated through a two-year experiment in the field condition. The results showed that large genotypic differences in lodging-related morphological traits were observed among these varieties. Lodging index (LI) of semi-dwarf varieties was significantly lower compared with that of SLX(Shenglixian). There were significant differences in LI among the semi-dwarf varieties, but no relationship between LI and the release year was found. Bending moment (BM) of semi-dwarf varieties released in 1940s-1980s was significantly lower than that of SLX. However, varieties released after 1980s had similar bending moment with SLX, but significantly higher breaking resistance (BR). The increase in both BM and BR after 1980s was related with the increase in internode diameter (ND) and stem fresh weight. Overall, this study disclosed the changing pattern of lodging-related traits in the genetic improvement of rice, and suggested that further increase in ND, internode dry weight (NDW) and dry weight per unit length (DWUL) of lower internode in modern super rice variety could effectively enhance lodging resistance and bring down LI.

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Section: Discussionmentioning

confidence: 99%

Changes in the Lodging-Related Traits along with Rice Genetic Improvement in China

Zhu

Wang

et al. 2016

PLoS ONE

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“…We hypothesise that the concept guiding most agronomic crop models, namely, that plants generally convert into biomass all resources available to them in the most efficient way, is in many cases wrong. There are numerous examples to the contrary, such as the case of hybrid vigour, which is mostly not related to higher leaf photosynthetic rates, nor to different crop architecture when compared to similar, high-yielding inbred lines (Laza et al 2001). Another, more extreme example is the physiology of temperate, perennial plants, which constitutionally have long lag phases between assimilate production and their re-investment in growth processes, involving large reserve compartments to buffer the asynchrony between supply and demand (Lechaudel et al 2005).…”

Section: Discussionmentioning

confidence: 99%

EcoMeristem, a model of morphogenesis and competition among sinks in rice. 1. Concept, validation and sensitivity analysis

Luquet

Dingkuhn

Kim

et al. 2006

Functional Plant Biol.

123

100

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Because of rapid advances in functional genomics there is an increasing demand for models simulating complex traits, such as the physiological and environmental controls of plant morphology. This paper describes, validates and explores the behaviour of the structural–functional model EcoMeristem, developed for cereals in the context of the Generation Challenge Program (GCP; CGIAR). EcoMeristem constructs the plant on the basis of an organogenetic body plan, driven by intrinsic (genetic) behavioural norms of meristems. These norms consist of phenological–topological rules for organ initiation and pre-dimensioning (sink creation) and rules enabling feedbacks of the plant’s resource status on the organogenetic processes. Plant resource status is expressed by a state variable called Internal Competition Index (Ic) calculated daily as the ratio of assimilate source (supply) over the sum of active sinks (demand). Ic constitutes an internal signal analogous to sugar signalling. Ic affects potential phytomer size, tiller initiation, leaf senescence, and carbohydrate storage and mobilisation. The model was calibrated and tested on IR64 rice grown in controlled environments, and validated with field observations for the same cultivar (Philippines). Observed distributions and dynamics of soluble sugars and starch in plant organs supported the model concepts of internal competition and the role of reserves as a buffer for Ic fluctuations. Model sensitivity analyses suggested that plant growth and development depend not only on assimilate supply, but also on organogenesis-based demand. If true, this conclusion has important consequences for crop improvement strategies.

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“…Thus, the genotype Boichi had really strong culm to resist the lodging. Plant height was not necessarily the most important factor in determining lodging resistance [23], but long culm length and large leaf area index rice varieties may cause an increase in bending moment [24], resulting in high lodging index [25]. Since smos1 (a stiff culm trait of rice mutant) possesses high breakingtype lodging resistance which is different from semi-dwarf plants with high bending type lodging resistance, an alternative approach of using thick culm lines for the creation of rice with increased lodging resistance is hereby proposed [26].…”

Section: Lodging Score At Normal Terminal Droughtmentioning

confidence: 99%

Genetic Diversity of Farmers’ Varieties of Rice (Oryza sativa L.) with Special Orientation to Lodging Characteristics

Debbarma¹,

Roy²

2017

J Rice Res

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Lodging status of rice is an important consideration for determination of grain yield and acceptability of the genotype among the rice farming community. In this communication, 59 local genotypes of rice were screened for lodging tolerance under three different cultivation environments. Boichi and Seshaphal were found to be highly lodging tolerant under all the three situations. Majority of the local genotypes were reported to be susceptible to lodging. The numbers of highly susceptible local genotypes towards lodging were 55, 29 and 15 at irrigated, drought created by spraying potassium iodide (KI) under irrigated condition and normal terminal drought environments, respectively. Lodging was more frequent in irrigated condition than the normal terminal drought condition or drought situation created by spraying of KI along with normal irrigation. The mean reduction in yield was more in the drought situation created by spraying of KI along with normal irrigation (20.62%) than the normal terminal drought (18.66%). The average lodging susceptibility also reduced in normal terminal drought condition (3.58) as compared to the drought situation created by spraying of KI along with normal irrigation (6.32). It has been reported that in most of the cases lodging caused remarkable yield loss.

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Higher Leaf Area Growth Rate Contributes to Greater Vegetative Growth of F₁ Rice Hybrids in the Tropics

Cited by 29 publications

References 7 publications

Changes in the Lodging-Related Traits along with Rice Genetic Improvement in China

Changes in the Lodging-Related Traits along with Rice Genetic Improvement in China

EcoMeristem, a model of morphogenesis and competition among sinks in rice. 1. Concept, validation and sensitivity analysis

Genetic Diversity of Farmers’ Varieties of Rice (Oryza sativa L.) with Special Orientation to Lodging Characteristics

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Higher Leaf Area Growth Rate Contributes to Greater Vegetative Growth of F1 Rice Hybrids in the Tropics

Cited by 29 publications

References 7 publications

Changes in the Lodging-Related Traits along with Rice Genetic Improvement in China

Changes in the Lodging-Related Traits along with Rice Genetic Improvement in China

EcoMeristem, a model of morphogenesis and competition among sinks in rice. 1. Concept, validation and sensitivity analysis

Genetic Diversity of Farmers’ Varieties of Rice (Oryza sativa L.) with Special Orientation to Lodging Characteristics

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Product

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Higher Leaf Area Growth Rate Contributes to Greater Vegetative Growth of F₁ Rice Hybrids in the Tropics