PLANTS
PLANT REPRODUCTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The FT gene product inhibits flowering at the apex and stimulates shoot growth
|
|
|
The FT mRNA is transported upwards in the xylem tot he apex
|
|
|
The FT gene is triggered by activated phytochrome (Pfr)
|
|
|
The FT gene stands for Fleure Terrifique
|
Detailed explanation-1: -In short-day plants flowering is inhibited by exposure to red light, and exposure to far red light will bring about flowering. It seems that these plants will flower only if the level of Pfr is low enough, but the situation in the long-day plants is reversed and flowering is triggered by high levels of Pfr.
Detailed explanation-2: -Red light from the sun converts the chromoprotein into Pfr (active form), so plants grow towards the sunlight. It stimulates the growth of the plant. Plants grow slowly in shade as soon as the dormant form (Pr) is produced. When a seed experiences light with the help of the phytochrome system, it germinates.
Detailed explanation-3: -Phytochromes are red-light photoreceptors that undergo reversible photoconversion between a red-light-absorbing state (Pr) and a far-red-light-absorbing state (Pfr), and thereby they regulate a wide range of physiological responses in plants, fungi, and photosynthetic bacteria (1–5).
Detailed explanation-4: -In these plants, when the day is long and the night is short, fewer Pfr molecules change into Pr during the night, leading to Pfr-dependent repression of flowering; by contrast, when the day is short and the night is long, more Pfr molecules change into Pr during the night, diminishing this repression.