番茄是重要的蔬菜作物，在世界范围内广泛种植。但这种常见的果蔬也面临着"相亲"难题。在繁衍 后代时，番茄有着复杂的"择偶"机制。 最近，中国科学院昆明植物研究所研究人员在学术期刊《新植物学家》上发表的一项新成果，揭开 了番茄种间单向不亲和反应的神秘面纱，为解决番茄"相亲"难题找到了新的方法。 种间单向不亲和阻碍番茄育种 番茄在种植过程中，很容易受到病虫害的多重影响，导致产量和品质下降。 以前，科学家发现，长期驯化使栽培番茄遗传多样性大幅降低，抗逆性减弱。相比之下，野生番茄 却有极高的遗传多样性，具有抗病虫害、抗旱和耐盐碱等优良特性。 为定向调控生殖障碍提供新靶点 此前，人们通过远缘杂交技术将野生番茄的优良基因导入栽培番茄，培育出高产、优质、抗逆性强 的新品种，推动番茄产业的可持续发展。但番茄种间单向不亲和的遗传密码迟迟未破解，郭晗团队为此 做了多年研究。 "野生潘那利番茄的单向不亲和反应，是由花粉端和花柱端的遗传因子共同调控的。"郭晗说，这些 因子通过复杂的互作网络，决定了花粉管能否在花柱中顺利生长。 郭晗团队在前人研究的基础上，发现了两个新的花粉种间单向不亲和位点，并对其功能作了验证。 这两个位点与已知的花粉 ...

Group 1 - The core viewpoint of the articles indicates that the vegetable prices in Jinan are gradually decreasing due to the increase in local vegetable supply as the weather warms up [1][3][5] - As of April 18, the average wholesale price of 28 types of vegetables in Jinan was 2.26 yuan per jin, reflecting a week-on-week decrease of 7.8% [1] - Specific examples of price changes include leeks dropping from 2.17 yuan per jin to 1.56 yuan, cabbage from 1 yuan to 0.77 yuan, and eggplants from 2.23 yuan to 1.49 yuan [1] Group 2 - Data from the Jinan Kuangshan Agricultural Products Wholesale Market shows that out of 15 common vegetables, 5 saw price increases, 1 remained stable, and 9 experienced price decreases, with an overall average price of 2.40 yuan per jin [3] - The overall trend indicates a seasonal decline in vegetable prices, primarily due to increased production and supply from local and surrounding areas as temperatures rise [3] - According to the Ministry of Agriculture and Rural Affairs, the average price of 28 monitored vegetables was 4.65 yuan per kilogram, which is a 0.2% decrease from the previous day [5]