Impact of Seedling Age and Nitrogen Application on Submergence Tolerance of Sub1 and Non-Sub1 Cultivars of Rice (Oryza sativa L.)

Gautam, Priyanka; Lal, Banwari; Tripathi, Rahul; Baig, M. J.; Shahid, Mohammad; Maharana, S.; Bihari, P.; Nayak, A. K.

doi:10.1007/s00344-016-9661-7

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…Grain yield consistently decreased with transplanted seedling age in studies of 13‐, 20‐ and 27‐d‐old seedlings (Thannunathan and Sivasubramanian, 2002; Shen et al, 2006; Pasuquin et al, 2008; Jia et al, 2014; Liu et al, 2015; Ko et al, 2017; Laing et al, 2018), and there was no significant difference in grain yield between transplanted 13‐ and 20‐d‐old seedlings under normal seeding density in the present study. These results are inconsistent with reports by Sarangi et al (2015) and Gautam et al (2017), mainly due to heavy monsoon rains and infrequent weather calamities in their regions of study. Ample spikelets per square meter are the guarantee of very high, stable yield (Lin et al, 2000).…”

Section: Discussioncontrasting

confidence: 99%

Enhancing Grain Yield and Operational Feasibility by Transplanting Young Hydroponically Grown Long‐Mat Rice Seedlings

Luo

Yin

et al. 2019

Agronomy Journal

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Seedling transplanting is one of the predominant rice production systems in China. The production of hydroponically grown long‐mat rice seedlings (HLMS) is a novel seedling cultivation method that reduces labor costs and improves efficiency. There is an urgent need to explore the optimum seedling age that maximizes grain yield from HLMS. Experiments were conducted to investigate the effects of seedling age on the seedling quality, field growth characteristics and grain yield of rice grown from HLMS. The grain yield was higher for young seedlings (13 d) than for older seedlings (27 d) as a result of robust seedling quality, increased mechanical transplanting quality, slight transplanting shock, sufficient tillers and increased panicle numbers in both cultivars when grown from HLMS under normal seeding density, and there was no significant difference in grain yield between transplanted 13‐ and 20‐d‐old seedlings. Moreover, the decreased yield in Wuyunjing24 might due to the reduced number of spikelets per panicle in old seedlings. In addition, the force of root entwining was significantly enhanced with increasing seedling age for both seedling cultivation methods and cultivars, and it was significantly higher for HLMS than for conventional mat seedlings raised in soil (CMSS). In general, transplanting young seedlings (13–20 d) by the HLMS method under normal seeding density brings better plant performance and higher yield than does transplanting older seedlings; relative to CMSS, HLMS increased the flexibility of seedling age (>7 d) and operational feasibility, which can be mainly ascribed to the enhanced force of root entwining. Core Ideas Hydroponically grown long‐mat seedlings significantly enhanced the force of root entwining (>8 kilograms per block), enabling rice seedlings of different ages to withstand farming operations. Relative to conventional mat seedlings raised in soil, hydroponically grown long‐mat seedlings increased the flexibility of seedling age at transplant (>7 d). Transplanting young seedlings (13–20 d) by the hydroponically grown long‐mat seedlings method achieved higher grain yield than did transplating older seedlings (27 d) under normal seeding density.

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Section: Discussioncontrasting

confidence: 99%

Enhancing Grain Yield and Operational Feasibility by Transplanting Young Hydroponically Grown Long‐Mat Rice Seedlings

Luo

Yin

et al. 2019

Agronomy Journal

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“…With increased submergence duration, tiller number, green leaves number, and dry weight of rice decreases. The survival and growth of rice are severely affected by submergence (Reddy and Mittra 1985; Gautam et al 2017; Wu and Yang 2016).…”

Section: Introductionmentioning

confidence: 99%

Ethylene signaling involves in seeds germination upon submergence and antioxidant response elicited confers submergence tolerance to rice seedlings

Huang

Yeh

Yang

2019

Rice

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Background Flooding has negative impact on agriculture. The plant hormone ethylene is involved in plant growth and stress responses, which are important role in tolerance and adaptation regulatory mechanisms during submergence stress. Ethylene signaling crosstalk with gibberellin signaling enhances tolerance in lowland rice (Flood Resistant 13A) through a quiescence strategy or in deepwater rice through an escape strategy when rice is submerged. Information regarding ethylene-mediated priming in submergence stress tolerance in rice is scant. Here, we used 1-aminocyclopropane-1-carboxylic acid, an ethylene precursor, to evaluate the response in submerged rice seedlings. Results The germination rate and mean germination times of rice seeds was higher in seedlings under submergence only when ethylene signaling was inhibited by supplemented with silver nitrate (AgNO 3 ). Reduced leaf chlorophyll contents and induced senescence-associated genes in rice seedlings under submergence were relieved by pretreatment with an ethylene precursor. The ethylene-mediated priming by pretreatment with an ethylene precursor enhanced the survival rate and hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 − ) anion accumulation and affected antioxidant response in rice seedlings. Conclusions Pretreatment with an ethylene precursor leads to reactive oxygen species generation, which in turn triggered the antioxidant response system, thus improving the tolerance of rice seedlings to complete submergence stress. Thus, H 2 O 2 signaling may contribute to ethylene-mediated priming to submergence stress tolerance in rice seedlings. Electronic supplementary material The online version of this article (10.1186/s12284-019-0284-z) contains supplementary material, which is available to authorized users.

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“…For example, proper nursery management of the seedlings with optimized fertilizer recipe, seed density, and transplanting time was found to be effective in improving rice yield under submergence [ 11 ]. Better submergence tolerance was also achieved by the application of growth regulators such as post-flood nitrogen, phytohormones, or hormone inhibitors [ 4 , 7 , 12 ]. It has been shown that submergence responses in rice are orchestrated by the interplay of various phytohormones, particularly ethylene, gibberellins (GA), and abscisic acid (ABA).…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic Analysis of Gibberellin- and Paclobutrazol-Treated Rice Seedlings under Submergence

Xiang

Zhang

et al. 2017

IJMS

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Submergence stress is a limiting factor for rice growing in rainfed lowland areas of the world. It is known that the phytohormone gibberellin (GA) has negative effects on submergence tolerance in rice, while its inhibitor paclobutrazol (PB) does the opposite. However, the physiological and molecular basis underlying the GA- and PB-regulated submergence response remains largely unknown. In this study, we reveal that PB could significantly enhance rice seedling survival by retaining a higher level of chlorophyll content and alcohol dehydrogenase activity, and decelerating the consumption of non-structure carbohydrate when compared with the control and GA-treated samples. Further transcriptomic analysis identified 3936 differentially expressed genes (DEGs) among the GA- and PB-treated samples and control, which are extensively involved in the submergence and other abiotic stress responses, phytohormone biosynthesis and signaling, photosynthesis, and nutrient metabolism. The results suggested that PB enhances rice survival under submergence through maintaining the photosynthesis capacity and reducing nutrient metabolism. Taken together, the current study provided new insight into the mechanism of phytohormone-regulated submergence response in rice.

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Impact of Seedling Age and Nitrogen Application on Submergence Tolerance of Sub1 and Non-Sub1 Cultivars of Rice (Oryza sativa L.)

Cited by 11 publications

References 35 publications

Enhancing Grain Yield and Operational Feasibility by Transplanting Young Hydroponically Grown Long‐Mat Rice Seedlings

Enhancing Grain Yield and Operational Feasibility by Transplanting Young Hydroponically Grown Long‐Mat Rice Seedlings

Ethylene signaling involves in seeds germination upon submergence and antioxidant response elicited confers submergence tolerance to rice seedlings

Transcriptomic Analysis of Gibberellin- and Paclobutrazol-Treated Rice Seedlings under Submergence

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