Sterility in Rice (Oryza Sativa L.) Subject to Drought during the Booting Stage Occurs not because of Lack of Assimilate or of Water Deficit in the Shoot but because of Dehydration of the Root Zone.

Kobata, Tohru; Tanaka, Satoru; Utumi, M.; Hara, Shinichi; Imaki, Tadashi

doi:10.1626/jcs.63.510

Cited by 17 publications

(8 citation statements)

References 16 publications

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“…These results are consistent with a role of root‐sourced signals on fertilization or early embryo growth. Spikelet fertility in rice is reported to be sensitive to nonhydraulic root signals (Kobata et al, 1994), and genetic differences in root‐sourced abscisic acid have been reported (Asch et al, 1995). The cultivars with similar maturity that could or could not exploit the Di environment would constitute a useful set of contrasts for studies on root signaling or VPD sensitivity in rice.…”

Section: Discussionmentioning

confidence: 99%

Interpreting Cultivar × Environment Interactions for Yield in Upland Rice

Lafïtte

Courtois

2002

Crop Sci.

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In contrast to most other cereal crops, rice originated from a semi-aquatic ancestor, and has limited tolerance Many morphological and physiological traits have been suggested to water deficit. A number of traits have been suggested as potential mechanisms of cultivar differences in rice (Oryza sativa L.) drought tolerance, but few data are available to link those traits as candidates for the improvement of rice drought tolerto variation in grain production in water-limited field environments.ance (Fukai and Cooper, 1995;Nguyen et al., 1997) TheWe evaluated 45 rice cultivars in managed stress environments to rice cultivars best adapted to dry conditions are upland relate cultivar ϫ environment (C ϫ E) interaction for yield to specific types, which are thought to have been selected by generputative drought-adaptive mechanisms. Cultivars were sown in aeroations of farmers beginning some 4000 yr ago (Chang, bic (nonflooded) fields across three seasons, under a range of irrigation 1976). Specific traits expected to improve water uptake systems, to generate nine contrasting environments. Data were col-(e.g., deep rooting; O'Toole and Bland, 1987) or reduce lected on yield, plant height, maturity, leaf area, relative water content unproductive water loss (e.g., greater epiculticular wax; (RWC), epidermal conductance, root pressure, canopy temperature O'Toole et al., 1979) are generally superior in upland (CT), and chlorophyll content. Mean grain yield ranged from 0.6 to cultivars. Other traits that might mitigate the impact of 2.0 Mg ha Ϫ1 across environments. Correlations between grain yields measured in different environments ranged from Ϫ0.14 to 0.86. Pat-water deficit on survival, such as osmotic adjustment, tern analysis revealed different cultivar responses in environments tend to be superior in lowland cultivars (Lilley and Ludwith continuous stress or stress during grain filling compared with low, 1996). Rice cultivars can be differentiated not only environments with ample water or environments with adequate drip on the basis of adaptation but also on the basis of subirrigation. Traits related to C ϫ E interaction scores for yield included species or isozyme group (Glazmann, 1987). Isozyme anthesis date, leaf percentage fresh weight (%FW), root pressure, leaf Group 6, the japonica subspecies, tends to be characterarea, and rooting depth. Early maturity was found to be advantageous ized by limited tillering, thick roots, and thick leaves. under drought, even when stress was applied at specific developmental Isozyme Group 1 (indica subspecies) has greater tillerstages for each cultivar. Separate pattern analyses for yield compoing, thin leaves, thinner roots, and greater capacity for nents confirmed that cultivar groups that interacted differently with osmotic adjustment. Cultivars from isozyme Group 2 environments for spikelet fertility and thousand-grain weight (TGW) also differed in specific drought-related traits.

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Section: Discussionmentioning

confidence: 99%

Interpreting Cultivar × Environment Interactions for Yield in Upland Rice

Lafïtte

Courtois

2002

Crop Sci.

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“…6. considered to be due to the severe water deficit of the shoot or roots around the time of flower initiation and heading (O'Toole, 1982;Kobata et al, 1994), which might be caused by the inhibition of root development into deep soil layers (Kobata et al, 2000). In most of the cultivars, the reduction of DW strongly contributed to the low yield in the rice under compacted soil conditions regardless of the soil moisture regime, although sterility also contributed under highly compacted and desiccated soil conditions through low HI (Fig.…”

Section: Factors Determining the Grain Yield Under Soil Compacted Conmentioning

confidence: 99%

Effect of Soil Compaction on the Grain Yield of Rice (Oryza sativaL.) under Water-Deficit Stress during the Reproductive Stage

Hoque

Kobata

2000

Plant Production Science

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“…In an alternate method, unfertilized spikelets are identified by checking the grains inside the spikelets on an illuminated light box and/or by crushing the grains with fi ngers (Hayase et al, 1969). The results obtained by the method using an illuminated plate and/or touching with fingers were in good agreement with the results obtained by the iodine reaction method (Hayase et al, 1969), and it has widely been used to determine sterility in temperature and water stress experiments (Satake and Yoshida, 1978;Ekanayake et al, 1990;Kobata et al, 1994;Matsui et al, 2001). However, identifi cation of unfertilized spikelets in rice is time consuming.…”

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confidence: 68%

“…Sterility in rice (Oryza sativa L.) increases when plants are subjected to a low temperature at booting (Hayase et al, 1969;Nishiyama, 1983) and to a high temperature at flowering (Satake and Yoshida, 1978;Nishiyama, 1983;Jagadish et al, 2007). Sterility strictly reduced the grain yield of plants grown in desiccated soil at booting (Kobata et al, 1994) and at flowering stages (Ekanayake et al, 1990). Sterility of rice in response to cool and high temperature conditions (Satake and Yoshida, 1978;Nishiyama, 1983;Matsui et al, 2001;Jagadish et al, 2007) or to desiccated soils (Kobata et al, 1994) would vary with the cultivar, and the cultivar difference is expected to be useful as a determining factor in the breeding of stressresistant cultivars.…”

mentioning

confidence: 99%

“…Sterility strictly reduced the grain yield of plants grown in desiccated soil at booting (Kobata et al, 1994) and at flowering stages (Ekanayake et al, 1990). Sterility of rice in response to cool and high temperature conditions (Satake and Yoshida, 1978;Nishiyama, 1983;Matsui et al, 2001;Jagadish et al, 2007) or to desiccated soils (Kobata et al, 1994) would vary with the cultivar, and the cultivar difference is expected to be useful as a determining factor in the breeding of stressresistant cultivars. Even under non-stress conditions, in high-yielding rice cultivars bearing heavy spikelets such as some indica x japonica or new plant type rice cultivars, sterility would be an important yield determination factor (Kobata and Uemuki, 2006).…”

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