水果变甜是用了“科技狠活”吗|成人做爰高潮片免费漫画视频

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  清甜可口的西瓜、香甜多汁的草莓……近年来,人们普遍感觉水果变得越来越甜。这份甜蜜让人们在大饱口福的同时也让不少消费者心生疑惑:这是用了“科技狠活”吗?

  中国农业科学院郑州果树研究所副研究员崔国朝告诉记者,近年来,水果整体甜度确实呈现上升趋势。以桃子为例,5年前,“赛桃会”上糖度能达到13%至14%的桃子已属优秀,但若将同样甜度的桃子放在今年“赛桃会”上,则仅够参赛资格,因为“佼佼者”的糖度高达18%至20%,口感更加甜润。

  崔国朝解释,这种甜度的显著提升,主要归功于农业科技的两大进步:一是育种技术的飞跃。可溶性固形物含量是影响水果口感的关键因素,大多数消费者喜欢偏甜的水果。随着分子育种技术的发展,科学家们已成功定位了西瓜、桃子等多种水果中调控甜度的关键基因。掌握了这一“秘密武器”,育种专家在选育新品种时,便能高效筛选并聚合与高甜度相关的优良基因,从而培育出综合品质优异、风味香甜的新品种。

  二是种植管理的精细化。现代水果种植正逐步告别粗放模式,走向标准化、专业化和规模化。通过优化果树树形结构、实施精准水肥管理,以及更高效地利用光能资源等先进农艺措施,果实内部的糖分积累得以显著提升。

  “另外,特定的气候条件,也会促进水果糖分累积。”崔国朝补充道,比如今年很多地方出现了高温干旱天气,这些地方的水果较往年普遍更甜。

  针对网上流传的“通过喷洒或注射甜蜜素来增甜水果”的说法,崔国朝明确表示,这不现实,一方面,喷施甜蜜素只能带来表皮或局部微弱的甜感,如同“蘸糖水”,无法渗透并改变果实内部品质和整体风味,增甜效果微乎其微;另一方面,注射甜蜜素会破坏果实的完整性,容易引发细菌感染,导致果实腐烂变质。另外,从实际操作层面,对大量水果进行逐个注射,不仅较繁琐还会带来高成本,不具备可行性。

  本报记者 沈 慧 来源:经济日报

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