In the field, root tissues may be e

In the field, root tissues may be exposed to sunlight due to
the penetration of solar irradiation into the upper layers of
the soil (Mandoli et al. 1990). Whereas the shoots bend
toward the direction of incoming blue (and white) light to
optimize leaf photosynthesis, roots grow away from these
light stimuli and hence avoid the stressful environment of
the upper soil layers. Thus, negative root phototropism,
documented for seedlings of mustard (S. alba) and some
other plant species, became a focus of research that was
summarized in the textbooks of Sachs (1882), Pfeffer
(1904), Strasburger et al. (1911) and others.

Hasil (Bahasa Indonesia) 1:

Di bidang, Jaringan akar dapat terpapar sinar matahari karenapenetrasi penyinaran matahari ke lapisan atasTanah (Mandoli et al., 1990). Sedangkan tunas menekukmenuju ke arah cahaya masuk biru (dan putih)mengoptimalkan fotosintesis daun, akar tumbuh dari inicahaya rangsangan dan karenanya menghindari lingkungan streslapisan tanah atas. Dengan demikian, negatif akar phototropism,didokumentasikan untuk bibit mustard (S. alba) dan beberapaspesies tanaman lainnya, menjadi fokus penelitian yangdiringkas dalam buku pelajaran Sachs (1882), Pfeffer(1904), Strasburger et al. (1911) dan lain-lain.