Plant Fitness Assessment for Wild Relatives of Insect Resistant Bt-Crops

Figure 3

(a) Year 2: mean (±1 SE) percent seedling mortality per plot (𝑛=30 plots with 4 plants each) in year two on exposed versus protected [tmt] wild mustard and radish [species] in disked field, field margin, and natural vegetation plots [hab]. Wild mustard bars, labeled “Mus,” precede wild radish bars, labeled “Rad.” Logistic regression showed significant effects for species (𝑑𝑓=1, 𝑋²=9.7, 𝑃=0.0019) and tmt (𝑑𝑓=1, 𝑋²=6.2, 𝑃=0.0127), but not strongly for hab (𝑑𝑓=2, 𝑋²=5.0, 𝑃=0.0826), and none for any of the interactions: species*hab, species*tmt, tmt*hab, or species*tmt*hab. (b) Year 2: mean (±1 SE) percent of plants per plot (𝑛=28–30 plots with 2 plants/plot) producing pods/siliques on exposed versus protected [tmt] wild mustard and radish [species] in disked field, field margin, and natural vegetation plots [hab]. Wild mustard bars, labeled “Mus,” precede wild radish bars, labeled “Rad.” Logistic regression shows significant effects for tmt (𝑑𝑓=1, 𝑋²=7.0, 𝑃=0.0082) and hab (𝑑𝑓=2, 𝑋²=7.5, 𝑃=0.0237), but not for species, species*hab, species*tmt, tmt*hab, or species*tmt*hab interactions.

(a)

(b)