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Latest Jasmonate Stories

Tobacco Plants Advertise They Are Ready To Attack Leafhoppers
2012-05-23 10:25:32

Like blood-sucking insects, herbivores evaluate their host's readiness for defense Tobacco: actually pretty bad food for leafhoppers Empoasca sp. is not a typical pest of wild tobacco (Nicotiana attenuata). When this plant grows in its natural habitats in North America, however, it is attacked by tobacco hornworm larvae (Manduca sexta). This specialist insect is resistant to the toxic nicotine, which the plant produces as a defense against its enemies. When researchers from the Max...

2012-04-09 13:25:33

Rice University study links touch-activated genes to both growth and insect defense A new study by Rice University scientists reveals that plants can use the sense of touch to fight off fungal infections and insects. The study, which will be published in the April 24 issue of Current Biology, finds that plant defenses are enhanced when plants are touched. “From previous studies, we knew that plants change their growth in response to touch but we didn´t know how these growth...

2012-02-14 11:08:44

Rice University study: Plants make predawn preparations to fend off hungry caterpillars In a study of the molecular underpinnings of plants' pest resistance, Rice University biologists have shown that plants both anticipate daytime raids by hungry insects and make sophisticated preparations to fend them off. "When you walk past plants, they don't look like they're doing anything," said Janet Braam, an investigator on the new study, which appears this week in the Proceedings of the...

2010-04-01 13:40:00

Plants respond to attacks by herbivores or pathogens by activating defense programs that drive off or even kill the attackers. These defense responses require a great deal of the plant's energy and reserves, which would otherwise be invested in growth and reproduction. So, it's very important to strictly control the activity of defense genes. Hormones, such as the jasmonates, are crucial in this process "“ and the plant produces these hormones when subjected to stress conditions. The...

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2010-03-29 09:22:15

Jasmonic acid triggers nectar accumulation in rapeseed flowers Rapeseed is one of the ten most important agricultural crops worldwide. In spring, the rapeseed fields with their bright yellow flowers are widely visible: this year winter rapeseed is being cultivated on 1.46 million hectares in Germany; at least 2.2 million tons of rapeseed oil can be expected. Beekeepers set up their beehives in the vicinity of rapeseed fields, so that the worker bees can gather nectar This ensures that the...

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2009-03-01 09:02:53

Ever since insects developed a taste for vegetation, plants have faced the same dilemma: use limited resources to out-compete their neighbors for light to grow, or, invest directly in defense against hungry insects. Now, an international team of scientists at the Salk Institute for Biological Studies and the Institute of Investigaciones Fisiol³gicas y Ecol³gicas Vinculadas a la Agronomía (IFEVA) has discovered how plants weigh the tradeoffs and redirect their...


Word of the Day
omadhaun
  • A fool; a simpleton: a term of abuse common in Ireland and to a less extent in the Gaelic-speaking parts of Scotland.
This word is partly Irish in origin.