Low temperature delayed cotton growth, increased abscission of reproductive organs, and seriously reduced quality yield. Moreover, failed or unstable performance insecticidal resistance due to adverse environments have been reported. In order study the impact low on protein contents at square stage in Bacillus Thuringenesis (Bt) transgenic cotton, different regimes durations were imposed two Bt cultivars, Sikang1 (the conventional cultivar, SK1) Sikang3 hybrid SK3). stress exhibited a...

Waterlogging caused by short and severe, or prolonged precipitation can be attributed to global warming. Pumpkin plants are drought-tolerant but not tolerate waterlogging stress. Under frequent rain conditions, the production of pumpkins is lower quality, sometimes rotten, harvest failure occurs in severe cases. Therefore, it great significance assess tolerance mechanism pumpkin plants. In this study, 10 novel varieties from Baimi series were used. The level was evaluated measuring...

Low temperature is the main factor for global natural disasters affecting growth and distribution of plants, cotton may be affected by low cold damage at all stages. In addition, insecticidal resistance cultivars has been reported to perform poorly or unstably due adverse environments. The present study aimed investigate impact on levels protein in Bacillus thuringiensis (Bt) transgenic plants during peak boll stage. To achieve this, two Bt cultivars, Sikang1 (SK1) Sikang3 (SK3), were...

This study used 27 Chinese pumpkin resources for the waterlogging treatment and analyzed 16 growth physiological indicators, including plant height stem diameter. The waterlogging-tolerant waterlogging-sensitive were selected using membership function grading method principal component analysis. changes in biochemical indicators of pumpkins under stress also studied. results showed that among resources, five materials ('013-2′, 'Changyi', 'Universal female parent', '450′, 'Changer'), two...

Sowing cotton directly after harvesting wheat in the Yangtze River Valley of China requires early mature without yield reduction. Boll-setting period synchronisation and more bolls distributed at upper middle canopy layers are also required for harvesting. The objective this study is to quantify individual interaction effects plant density growth regulator mepiquat chloride (MC) on temporal spatial distributions bolls, as well components. During 2013–2016 growing seasons, experiments were...

Abstract The bollworm can be controlled effectively with Bacillus thuringiensis transgenic cotton (Bt cotton) which is being applied worldwide. However, the insecticidal efficacy not stable. Here we give a summary of research progress for mechanism altered efficacy, factors affecting expression insect resistance, agronomic practices on regulation in Bt cotton. To realize potential cultivars, future may conducted by increasing synthesis and reducing degradation protein to maintain high...

High yield is the most important goal for cotton growers, but widely application of previous reported agronomic practices was difficult due to variations locations, climate, and cropping system in Yangtze River area. It desirable find an universal index indicate canopy structure photosynthetic production states high yield. Field studies with different planting densities, sown dates nitrogen rates were conducted detect relationship between lint number fruiting nodes per hectare (FNN) during...

[Objective] This study aims to analyze the effects of plant growth regulator Miantaijin (N,N-dimethyl piperidinium chloride and 2-N,N-diethylaminoethyl caproate) planting density on yield nitrogen (N), phosphorus (P), potassium (K) uptake accumulation in cotton. The results will clarify high-yield cultivation techniques cotton direct seeding after wheat harvesting cropping system Yangtze River Basin. [Method] In 2017 2018, cultivar Guoxinzao 11-1 was planted at 3 densities (75,000, 90,000,...

To clarify the effect of N deficit on amount square Bt insecticidal protein, different application rates (0, 75, 150, 225, and 300 kg ha–1) were imposed conventional cultivar Sikang 1 (SK-1) hybrid 3 (SK-3) during 2015–2016 cotton growth seasons. Under rates, number per plant, volume dry weight reduced when decreased from rate (300 to 0 ha–1. And protein content accordingly. The analysis metabolism showed that soluble content, GPT GOT activities decreased, free amino acid, peptidase protease...

During the boll formation stage, cotton bolls exhibit lowest expression of insecticidal proteins. Insect resistance varies notably among different organs, posing challenges for controlling bollworms. Consequently, a strategy was designed in 2020-2021 growing season to coordinate enhancement protein synthesis and attenuation degradation. Two Bt cultivars G. hirsutum, namely hybrid Sikang 3 conventional 1, were used as test materials. Three treatments implemented: CK (the control), T1 (amino...

High-temperature stress reduces the endotoxin expression of insecticidal gene (Cry1Ac) in transgenic Bacillus thuringiensis (Bt) cotton and affects nitrogen metabolism. However, its effects on Cry1Ac after high-temperature termination remain unclear. In order to investigate effect proteins Bt squares, conventional Sikang-1 cultivar hybrid Sikang-3 were used as experimental materials. The potted plants squaring stage moved an artificial climatic chamber at 38 °C for 72 h 96 2017 2018,...

In Bacillus thuringenesis (Bt) transgenic cotton, the cotton boll has lowest insecticidal protein content when compared to other organs. The present study investigated effects of amino acid spray application at peak flowering stage on Bt toxin concentration and yield formation. Boll synthesis carbohydrate conversion were also studied reveal fundamental mechanism. Three treatments (i.e., CK, untreated control; LA1, five acids; LA2, 21 acids) applied two cultivars G. hirsutum hybrid Sikang 3...

As one of the most important edible legumes worldwide, faba bean can be grown for grain, feed, vegetable, fertilizer, medicine and deep processing. In this study, experiments were designed to determine combined effect organic inorganic fertilizers on growth development bean. Dabaipi (a cultivar Vicia L.) was used experiments. Five treatments with different ratios nitrogen (N) total N applied, including 0% fertilizer (0% OF), 25% OF, 50% 75% 100% OF OF. Chemical urea as an fertilizer. The...

Cotton bolls exhibit the lowest insecticidal efficacy among all organs of Bt cotton, which would ultimately affect yield formation. The objective this study was to investigate effects different urea concentrations on seed protein contents, cotton and corresponding metabolism mechanism. experiments were conducted during 2017–2018 growing seasons. Two cultivars, Sikang 3 (hybrid, SK3) 1 (conventional, SK1), treated with six their contents compared boll formation period. spray concentration had...

Plant density is the cultivation practice usually employed to manipulate boll distribution, setting and yield in cotton production. In order determine effect of plant on insecticidal protein content Bacillus thuringiensis (Bt) plants, a study was conducted Yangzhou University China 2015 2016. Five densities (PD1-PD5, representing 15000, 30000, 45000, 60000, 75000 plants ha−1) were imposed two Bt cultivars, Sikang 1 (the conventional cultivar, SK-1) 3 hybrid SK-3). The number per plant,...

Bt cotton production is mainly challenged by two problems, i.e., the low concentration of Bacillus thuringiensis (Bt) protein at boll setting stage and its lowest insect resistance in bolls all organs. Therefore, increasing stage, especially bolls, has become main goal cotton. In this study, degradation inhibitors (EDTA Leupeptin) were sprayed on subtending leaves, whole plants respectively peak flowering cultivars (medium maturation Sikang 1 (SK1) early Zhongmian 425 (Z425)) 2019 2020,...

The effects of mepiquat chloride (DPC) on Cry1Ac protein contents in Bacillus thuringiensis (Bt) cotton boll shells under high temperature and drought stress were investigated to provide a theoretical reference for Bt breeding high-yield high-efficiency cultivation. This study was undertaken the cultivar 'Sikang 3' during 2020 2021 growing seasons at Yangzhou University Farm, Yangzhou, China. potted plants exposed stress, 20 mg L−1 DPC water (CK) sprayed plants. Seven days after treatment,...

The direct-sown cotton after wheat harvest (DSCWH) cropping system has attracted wide attention due to reduced labor inputs compared transplanting. However, the management strategy of slow-release nitrogen is unclear in such a system. This study aims investigate impact different timings and dosages fertilizer on yield, biomass accumulation distribution, absorption utilization DSCWH was investigated at experimental farm Yangzhou University, China 2020 2021, with short-season variety...

Sudden temperature drops, resulting from extreme weather events, often occur during the boll-setting period of cotton in Xinjiang, China, causing decreased expression Bacillus thuringiensis (Bt) insecticidal proteins bolls. The precise threshold temperatures and durations that lead to significant changes Cry1Ac endotoxin levels under low remain unclear. To address this, we investigated effects different stress on In 2020–2021, two Bt transgenic varieties, conventional Sikang1 hybrid Sikang3,...

刘震宇 王桂霞