Give a short account of phytochrome mediated photomorphogenetic responses in plants.
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ᴘʜᴏᴛᴏᴍᴏʀᴘʜᴏɢᴇɴᴇsɪs ɪs ʟɪɢʜᴛ-ᴍᴇᴅɪᴀᴛᴇᴅ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ, ᴡʜᴇʀᴇ ᴘʟᴀɴᴛ ɢʀᴏᴡᴛʜ ᴘᴀᴛᴛᴇʀɴs ʀᴇsᴘᴏɴᴅ ᴛᴏ ᴛʜᴇ ʟɪɢʜᴛ sᴘᴇᴄᴛʀᴜᴍ. ᴛʜɪs ɪs ᴀ ᴄᴏᴍᴘʟᴇᴛᴇʟʏ sᴇᴘᴀʀᴀᴛᴇ ᴘʀᴏᴄᴇss ғʀᴏᴍ ᴘʜᴏᴛᴏsʏɴᴛʜᴇsɪs ᴡʜᴇʀᴇ ʟɪɢʜᴛ ɪs ᴜsᴇᴅ ᴀs ᴀ sᴏᴜʀᴄᴇ ᴏғ ᴇɴᴇʀɢʏ. ᴘʜʏᴛᴏᴄʜʀᴏᴍᴇs, ᴄʀʏᴘᴛᴏᴄʜʀᴏᴍᴇs, ᴀɴᴅ ᴘʜᴏᴛᴏᴛʀᴏᴘɪɴs ᴀʀᴇ ᴘʜᴏᴛᴏᴄʜʀᴏᴍɪᴄ sᴇɴsᴏʀʏ ʀᴇᴄᴇᴘᴛᴏʀs ᴛʜᴀᴛ ʀᴇsᴛʀɪᴄᴛ ᴛʜᴇ ᴘʜᴏᴛᴏᴍᴏʀᴘʜᴏɢᴇɴɪᴄ ᴇғғᴇᴄᴛ ᴏғ ʟɪɢʜᴛ ᴛᴏ ᴛʜᴇ ᴜᴠ-ᴀ, ᴜᴠ-ʙ, ʙʟᴜᴇ, ᴀɴᴅ ʀᴇᴅ ᴘᴏʀᴛɪᴏɴs ᴏғ ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏᴍᴀɢɴᴇᴛɪᴄ sᴘᴇᴄᴛʀᴜᴍ.
ᴛʜᴇ ᴘʜᴏᴛᴏᴍᴏʀᴘʜᴏɢᴇɴᴇsɪs ᴏғ ᴘʟᴀɴᴛs ɪs ᴏғᴛᴇɴ sᴛᴜᴅɪᴇᴅ ʙʏ ᴜsɪɴɢ ᴛɪɢʜᴛʟʏ ғʀᴇϙᴜᴇɴᴄʏ-ᴄᴏɴᴛʀᴏʟʟᴇᴅ ʟɪɢʜᴛ sᴏᴜʀᴄᴇs ᴛᴏ ɢʀᴏᴡ ᴛʜᴇ ᴘʟᴀɴᴛs. ᴛʜᴇʀᴇ ᴀʀᴇ ᴀᴛ ʟᴇᴀsᴛ ᴛʜʀᴇᴇ sᴛᴀɢᴇs ᴏғ ᴘʟᴀɴᴛ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ ᴡʜᴇʀᴇ ᴘʜᴏᴛᴏᴍᴏʀᴘʜᴏɢᴇɴᴇsɪs ᴏᴄᴄᴜʀs: sᴇᴇᴅ ɢᴇʀᴍɪɴᴀᴛɪᴏɴ, sᴇᴇᴅʟɪɴɢ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ, ᴀɴᴅ ᴛʜᴇ sᴡɪᴛᴄʜ ғʀᴏᴍ ᴛʜᴇ ᴠᴇɢᴇᴛᴀᴛɪᴠᴇ ᴛᴏ ᴛʜᴇ ғʟᴏᴡᴇʀɪɴɢ sᴛᴀɢᴇ (ᴘʜᴏᴛᴏᴘᴇʀɪᴏᴅɪsᴍ).
ᴍᴏsᴛ ʀᴇsᴇᴀʀᴄʜ ᴏɴ ᴘʜᴏᴛᴏᴍᴏʀᴘʜᴏɢᴇɴᴇsɪs ᴄᴏᴍᴇs ғʀᴏᴍ ᴘʟᴀɴᴛs, ɪᴛ ᴏᴄᴄᴜʀs ɪɴ sᴇᴠᴇʀᴀʟ ᴋɪɴɢᴅᴏᴍs: ғᴜɴɢɪ, ᴍᴏɴᴇʀᴀ, ᴘʀᴏᴛɪsᴛᴀ, ᴀɴᴅ ᴘʟᴀɴᴛᴀᴇ.
