Drought has become one of the environmental threats to agriculture and food security. Applications melatonin (MT) serve as an effective way alleviate drought stress, but underlying mechanism remains poorly understood. Here, we found that foliar spray 100-µM MT greatly mitigated severe stress-induced damages in rice seedlings, including improved survival rates, enhanced antioxidant system, adjusted osmotic balance. However, mutation suppressor G2 allele skp1 (OsSGT1) ABSCISIC ACID INSENSITIVE...

Abstract Background Leaf water content (LWC) significantly affects rice growth and development. Real-time monitoring of leaf status is essential to obtain high yield use efficiency plants with precise irrigation regimes in fields. Hyperspectral remote sensing technology widely used crop because its rapid, nondestructive, real-time characteristics. Recently, multi-source data have been attempted integrate into a monitored model based on spectral indices. However, there are fewer studies using...

Large-panicle rice varieties often fail to achieve their yield potential due poor grain filling of late-flowering inferior spikelets (IS). The physiological and molecular mechanisms IS filling, whether an increase in assimilate supply could regulate protein abundance consequently improve for japonica with large panicles is still partially understood. A field experiment was performed two spikelet removal treatments at anthesis the large-panicle line W1844, including top 1/3 (T1) 2/3 (T2), no...

A sensitive and selective colorimetric sensor was designed for cysteine detection based on a high activity peroxidase-mimicking gold@platinum bimetallic nanoparticle-supported molybdenum disulfide nanohybrid.

To increase the seed setting rate and yield of large-panicle rice varieties, one agronomic breeding strategy is to proportion spikelets in middle portion panicle as many lower fail produce grains. Current nitrogen management during development mainly focuses on fertilization at emergence top fourth leaf, which increases number secondary branch part panicle. Two-year field experiments were conducted 2021 2022 with two typical hybrid indica cultivars, IIYM86 JLY8612. Nitrogen was applied fifth...

Field experiments of nitrogen (N) treatment at five different application rates (0, 75, 150, 225, and 300 kg ha−1) were conducted under pot-seedling mechanical transplanting (PMT) in 2018 2019. Two high-quality high-yielding hybrids indica rice, Huiliangyou 898 Y Liangyou 900, used this study. The N nutrition index (NNI) accumulated deficit (Nand), to assess the status real-time, calculated for cultivars PMT with a critical concentration (Nc) dilution model based on shoot dry matter (DM)...

The objectives of this field experiment were to study the growth characteristics and yield potential rice plants under non-flooded irrigation in arid area. Non-flooded treatments included drip with plastic mulching (DIs), furrow treatment (FIM) non-mulching (FIN). Conventional flooded cultivation (F) was check (CK). four differed amount water applied before after panicle initiation. Root length density, leaf dry weight, shoot weight root activity generally higher non-flood-irrigated...

Water-saving and drought-resistant rice (WDR) has high a yield potential in drought. However, the photosynthetic adaptation mechanisms of WDR to drought rehydration have yet be conclusively determined. Hanyou 73 (HY73, WDR) Huanghuazhan (HHZ, drought-sensitive cultivar) cultivars were subjected stress rewatering when soil water was −180 KPa booting stage. The leaf physiological characteristics dynamically determined at 0 KPa, −30 −70 first, fifth, tenth day after rewatering. It found that...

Water-saving and drought-resistant rice (WDR) is widely grown in central China recent years. However, studies have not explored the interaction effect of WDR irrigation regimes on drought-resistance capacities under severe drought at sensitive growth periods. A pot experiment was conducted using a cultivar Hanyou73 (HY73) traditional high-yielding drought-sensitive Huiliangyou 898 (HLY898). Three regimes, including flooding (W1), mild wetting-drying alternation (W2), (W3), were applied...

The purpose was to comprehensively compare the prediction accuracy of different nitrogen nutrition indexes (NNILAI and NNIDM) derived from critical concentration (Nc) models established by leaf area index (LAI) dry matter (DM) in estimating grain yield indica hybrid rice grown machine-transplanted bowl seedlings. Therefore, field experiments were conducted with two high-yielding varieties five application rates 2018 2019. results show that NNIDM peaked stem elongation stage, while NNILAI had...

The vascular bundles of rice panicles serve to connect the source and sink, as well serving a channel for transportation materials. In this study, two homozygous japonica strains were used bundle structures branches in different positions within panicle observed, their cross-sectional areas calculated. addition, ultrastructure central large (LVB) phloem rachillae superior spikelets (SS) inferior (IS) was observed during grain filling period. Moreover, soluble sugar protein contents SS IS...

ABSTRACT The rice ( Oryza sativa L.) mutant G 9 , isolated from ‘Guangzhan63S’ exposed to 60 Co γ irradiation in combination with vitro tissue culture, exhibits albino and growth stage‐dependent green‐revertible phenotypes. phenotype was observed the seedlings up fourth leaf (L4) stage, then entered into a transit period when old newly extended leaves gradually revert partial green. Finally, turn full green at sixth (L6) stage. Chlorophyll abundance second (L2) stage quite low increased...

The prediction skill of Arctic Oscillation (AO) in the decadal experiments with Beijing Climate Center System Model version 1.1 (BCC_CSM1.1) is assessed. As compared observations and historical experiments, contribution initialization for climate model to predict seasonal scale AO its interannual variations estimated. Results show that spatial correlation coefficient mode simulated by experiment higher than experiment. two groups reasonably reproduce characteristics indices are strongest...

Abstract Japonica rice ( Oryza sativa L.) plants with large source (dry matter) and great sink (spikelets per unit area) have higher yield nitrogen‐use efficiency (HYNUE) than small source–sink characteristics. Nitrogen (N) distribution traits between organs at heading can be important HYNUE factors for rice. Two cultivars of Yongyou1540 (large sizes) Zhendao18 (small were tested N fertilizer treatments in field experiments. The results indicated that the content ratios to panicle organ...

Abstract Water-saving and drought-resistant rice (WDR) is a new type of varieties. It plays an important role in responding to drought with high yield has been widely planted central China at present. High photosynthetic production potential caused by mesophyll conductance ( g m ) the main factor promoted formation for WDR. But little known about physiological molecular mechanisms regulated Therefore, WDR cultivar HY73 drought-sensitive HLY898 were used comparative studies three irrigation...

<p id="C2">To clarify the suitable types of rice varieties and mechanism high yield formation, we mainly analyzed difference between<italic> indica</italic> <italic>japonica</italic> in late season northern margin double-cropping along Yangtze River. The experiment was conducted from 2018 to 2019 Lujiang, Anhui province. differences components, dry matter accumulation, growth period between <italic>indica</italic> were compared through 17 (strains) which cultivated this local area. results...