全国100所名校最新高考冲刺卷英语2023届Y1
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chemicals.Gregg Howe's team changed 10 of its 13 JAZ genes of
Arabidopsis,so they made less of those JAZ proteins.Such
plants were in defensive mode nearly all of the time.
And they paid a price.They grew shorter than normal and
were
weaker.These plants also made fewer seeds that were via-
ble(可生长发育的).The plants also developed brown and with
ered (leaves.This showed that the engineered plants
were being starved of the carbon they need for growth.Carbon
starvation happens when plants close up the tiny holes in their
leaves known as stomata.Those holes let leaves breathe in the
carbon dioxide they need to make food.When plants keep their
defenses turned on all the time,they use up
energy.
“When
plants use those resources for defense-in this case,a defense