What specialized plant tissue conducts nutrients downward?

Phloem

Who was cursed by Hera to repeat words she hears, leading Narcissus to heartbreak? What vegetable was originally used to carve jack-o'-lanterns? What desert lies primarily within Mongolia and China? Who is famous for famously performing percussion with The Beatles during their rooftop concert? Who guides you through Aperture Science labs in Portal 2 besides GLaDOS?