Potassium (K) is fundamental for plant growth and development but despite the increased quantities of fertilizers applied, incidents of K deficiency are commonly observed. The objective of this study was to record the effects of K deficiency during cotton's (Gossypium hirsutum L.) early reproductive stage on carbohydrate content and metabolism, total antioxidant capacity and oxidative damage of cotton flower buds as well as the physiology of the leaf, subtending to the flower buds. Growth chamber experiments were conducted using cotton cultivar DP0912 and treatments consisted of normal K and deficient K fertilization for the duration of the experiment. Potassium deficiency resulted in significant oxidative damage in the cotton flower buds, despite the substantial increase in their total antioxidant capacity. Sucrose metabolism of the flower buds was markedly affected resulting in significant reductions in all non-structural carbohydrate concentrations. Furthermore, K deficiency disturbed leaf physiology leading to increased membrane damage, decreases in chlorophyll and carotenoid content and ultimately leaf photosynthetic rates. Concomitant increases in specific leaf weight under K deficient conditions indicated reductions in photoassimilate translocation, which in conjunction with the disruptions observed in flower bud sucrose metabolism, due to the insufficient antioxidant response, resulted in significant decreases in flower bud retention.
Abstract Background: Drosophila suzukii has been widely distributed all over the world since 2008, and it is a harmful pest causing great economic loss in many countries. Previous research has found that the presence of Drosophila melanogaster could reduce the emergence and egg laying of Drosophila suzukii . In order to figure out the potential mechanism of this phenomenon, we studied three potential factors including lifetime, larval interspecific competition, and reproductive interference. Results: The results show that the Drosophila suzukii offspring number was significantly decreased when reared with Drosophila melanogaster . The lifetime and larval interspecific competition have no significant effect on the Drosophila suzukii population. Surprisingly, Drosophila melanogaster can cause reproductive interference with male Drosophila suzukii , which leads to a significant decline in the successful mating rate of the latter fruit fly. Conclusions: The presence of Drosophila melanogaster causes the Drosophila suzukii population to decrease through the effect of reproductive interference, and the Drosophila suzukii successful mating rate is significantly decreased for the existence of Drosophila melanogaster .
This article describes the characteristics of black bamboo, the culture origins of Goddess of Mercy in Putuo Mountain and the Connection between them; reviewed the cultural history of the black bamboo in Putuo Mountain that is currently crossing the stage of from the " having bamboo" to "excellent bamboo". Based on the analysis of the plant status about black bamboo in Putuo Mountain, we put forward the strategy and method for creating “the realm of black bamboo”. To create a Haitian Buddha describes the characteristics of the plant landscape operable prospects, and this also indicates an operable prospect of bringing about the plants landscape characterized by the blue sky, the blue sea and the Buddha land.
The rapid development of artificial intelligence (AI) technology, while empowering higher education, has also introduced anxiety and stress among university students. This study examines the impact of AI anxiety on motivated learning and the moderating role of AI self-efficacy. Data were collected from 387 valid questionnaires at a university in China, and the hypotheses were analyzed using SPSS 25.0 and PROCESS plug-in. The results indicate that AI anxiety, encompassing the dimensions of learning, AI configuration, job replacement, and sociotechnical blindness, has a positive impact on motivated learning, and AI self-efficacy positively moderates the relationship between AI learning anxiety and motivated learning. Specifically, AI self-efficacy enhances the positive effect of AI learning anxiety on motivated learning. This study contributes to the existing literature and offers insights for the application of AI in higher education practice.
TRIM proteins are a group of highly conserved proteins that participate in a variety of biological processes in innate immunity. However, the roles of the Acipenseridae trim genes in the anti-bacterial immune response remained uncertain. In the present study, the Dabry's sturgeon (Acipenser dabryanus) TRIM2, TRIM8, and TRIM59 protein sequences were found to be similar to Chicken (Gallus gallus), with identities 92.8%, 89.1%, and 79.4%, respectively. Meanwhile, the TRIM23, TRIM37, and TRIM82 proteins shared 95.8%, 81.7%, and 78.1% similarity with Zebrafish (Danio rerio) homologs, respectively. Sequence alignment indicated that these six adTRIMs contained incomplete domains at their N-termini, including a RING-finger domain and one or two B-boxes domains. The six adtrim genes were constitutively expressed in immune related tissues, such as the head kidney, and were also expressed in non-immune related tissues, like the blood, brain, muscle, and liver. After challenge with Aeromonas hydrophila, the expression levels of adtrims changed during the early stage of infection. Stimulation by A. hydrophila upregulated the expression levels of adtrim8 and adtrim59 in the spleen and caudal kidney, while the expression of adtrim82 in the spleen and caudal kidney was inhibited at 12 hr post-infection. A. hydrophila challenge led to significant upregulation of adtrim2 and downregulation of adtrim23 in the spleen. In addition, adtrim37 was only weakly affected by A. hydrophila stimulation. These results suggested that adtrims were related to the immune response to bacterial infection, which provides the fundamental basis for protecting Dabry's sturgeon against pathogen attack.
The N absorption and assimilation is critical for the rice (Oryza sativa L.) yield increase when overdose N was applied in rice production. Three different rice genotypes, 'Quanliangyou 1' (Q1), 'Quanliangyou 681' (Q681) and 'Huanghuazhan' (HHZ), were selected to investÃgate the effects of elevated N input on the N partitioning, plant growth, grain quality and key genes involved in glutamate biosynthesis. Under increasing N inputs (0, 120, 180, 250 kg ha-1), N content in leaf, culm, seed and root were increased significantly. The increased N was preferentially deposited in leaf and culm. Tiller number, panicle number and length were also proved to be significantly promoted, but plant height and 1000-grain weight were nonsignificantly affected under elevated N input. Under high N input, seed protein content was elevated, while fatty acid and amylose content remained unchanged in comparison to low N input, but amylopectin content decreased. For the key genes in N assimilation, glutamine synthetase (OsGS1;1) could be induced by increasing N input (0 to 180 kg ha-1) but higher N input (250 kg ha-1) inhibit its expression, which showed similar response pattern with the glutamine synthetase activity. Although different rice genotypes showed similar response pattern to elevated N input, each genotype varied a lot in certain phenotypic indexes. And the response pattern of all these phenotypic characteristics to elevated N input was independent of rice genotype. These findings suggest that elevated N input could promote rice growth, reallocate N content in different tissues, and have negative impact on grain quality. This study provided physiological and molecular foundation for rice breeding and cultivation under high N input.
Potassium deficiency is a major problem limiting tobacco ( Nicotiana tabacum ) growth, and grafting has the potential to alleviate it. To compare the photosynthetic performance of grafted tobacco under different potassium levels, tobacco Yunyan 87 (main cultivar) and Wufeng No. 2 (potassium high-efficiency cultivar) were selected to conduct mutual grafting trials in the form of hydroculture with two potassium supply levels (5 mmol·L −1 K and 0.5 mmol·L −1 K). The plant growth, gas exchange parameters, chlorophyll a fluorescence, and the initial ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO) activity were measured. The results showed that potassium deficiency could significantly decrease the net photosynthetic rate, stomatal conductance ( g S ), and transpiration rate in the tobacco leaves, resulting in nonstomatal restriction. Grafting could effectively alleviate this problem. The actual quantum yield of photosystem II (PSII) photochemicals in ‘Yunyan 87’ increased 29.4% and 20.3% by grafting, respectively, under normal and low potassium levels. Compared with nongrafted ‘Yunyan 87’, grafting also effectively improved the electron transfer efficiency of PSII in the tobacco leaves under low potassium stress by reducing nonradiation energy dissipation and enhancing the initial activity of RuBisCO. From this study, it can be known that grafted tobacco plants can improve their photosynthesis by alleviating the nonstomata restriction of leaves under potassium stress and improving the electron transfer efficiency of PSII.
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